Sample records for synthetic-based drilling fluids

  1. Effect of non-aqueous drilling fluid and its synthetic base oil on soil health as indicated by its dehydrogenase activity

    Microsoft Academic Search

    Kanchan Wakadikar; Avik Sil; Niranjan Kolekar; Shalini Tandon; Rakesh Kumar

    Drilling fluids are used for drilling natural gas, oil and water wells. These spill over into the surrounding soil at the\\u000a point of drilling, which may impair soil health. A laboratory investigation was carried out to determine the effect of non\\u000a aqueous drilling fluid (NADF) and synthetic base oil used with it on soil health as indicated by the dehydrogenase

  2. Disposal of drilling fluids

    SciTech Connect

    Bryson, W.R.

    1983-06-01

    Prior to 1974 the disposal of drilling fluids was not considered to be much of an environmental problem. In the past, disposal of drilling fluids was accomplished in various ways such as spreading on oil field lease roads to stabilize the road surface and control dust, spreading in the base of depressions of sandy land areas to increase water retention, and leaving the fluid in the reserve pit to be covered on closure of the pit. In recent years, some states have become concerned over the indescriminate dumping of drilling fluids into pits or unauthorized locations and have developed specific regulations to alleviate the perceived deterioration of environmental and groundwater quality from uncontrolled disposal practices. The disposal of drilling fluids in Kansas is discussed along with a newer method or treatment in drilling fluid disposal.

  3. Drilling fluid filter

    DOEpatents

    Hall, David R.; Fox, Joe; Garner, Kory

    2007-01-23

    A drilling fluid filter for placement within a bore wall of a tubular drill string component comprises a perforated receptacle with an open end and a closed end. A hanger for engagement with the bore wall is mounted at the open end of the perforated receptacle. A mandrel is adjacent and attached to the open end of the perforated receptacle. A linkage connects the mandrel to the hanger. The linkage may be selected from the group consisting of struts, articulated struts and cams. The mandrel operates on the hanger through the linkage to engage and disengage the drilling fluid filter from the tubular drill string component. The mandrel may have a stationary portion comprising a first attachment to the open end of the perforated receptacle and a telescoping adjustable portion comprising a second attachment to the linkage. The mandrel may also comprise a top-hole interface for top-hole equipment.

  4. Optimizing drilling performance using a selected drilling fluid

    DOEpatents

    Judzis, Arnis (Salt Lake City, UT); Black, Alan D. (Coral Springs, FL); Green, Sidney J. (Salt Lake City, UT); Robertson, Homer A. (West Jordan, UT); Bland, Ronald G. (Houston, TX); Curry, David Alexander (The Woodlands, TX); Ledgerwood, III, Leroy W. (Cypress, TX)

    2011-04-19

    To improve drilling performance, a drilling fluid is selected based on one or more criteria and to have at least one target characteristic. Drilling equipment is used to drill a wellbore, and the selected drilling fluid is provided into the wellbore during drilling with the drilling equipment. The at least one target characteristic of the drilling fluid includes an ability of the drilling fluid to penetrate into formation cuttings during drilling to weaken the formation cuttings.

  5. Drilling fluid disposal

    SciTech Connect

    Nesbitt, L.E.; Sanders, J.A.

    1981-12-01

    A maze of U.S. regulations and regulatory agencies coupled with uncertainty in interpretation of environmental data and an evolving system of disposal engineering will require industry action to monitor the area and derive a solid engineering basis for disposal of spent drilling fluid. A set of disposal methods with approximate costs is presented to serve as an initial guide for disposal. 16 refs.

  6. Application of Ester based Drilling Fluid for Shale Gas Drilling

    NASA Astrophysics Data System (ADS)

    Sauki, Arina; Safwan Zazarli Shah, Mohamad; Bakar, Wan Zairani Wan

    2015-05-01

    Water based mud is the most commonly used mud in drilling operation. However, it is ineffective when dealing with water-sensitive shale that can lead to shale hydration, consequently wellbore instability is compromised. The alternative way to deal with this kind of shale is using synthetic-based mud (SBM) or oil-based mud (OBM). OBM is the best option in terms of technical requirement. Nevertheless, it is toxic and will create environmental problems when it is discharged to onshore or offshore environment. SBM is safer than the OBM. The aim of this research is to formulate a drilling mud system that can carry out its essential functions for shale gas drilling to avoid borehole instability. Ester based SBM has been chosen for the mud formulation. The ester used is methyl-ester C12-C14 derived from palm oil. The best formulation of ester-based drilling fluid was selected by manipulating the oil-water ratio content in the mud which are 70/30, 80/20 and 90/10 respectively. The feasibility of using this mud for shale gas drilling was investigated by measuring the rheological properties, shale reactivity and toxicity of the mud and the results were compared with a few types of OBM and WBM. The best rheological performance can be seen at 80/20 oil-water ratio of ester based mud. The findings revealed that the rheological performance of ester based mud is comparable with the excellent performance of sarapar based OBM and about 80% better than the WBM in terms of fluid loss. Apart from that, it is less toxic than other types of OBM which can maintain 60% prawn's survival even after 96 hours exposure in 100,000 ppm of mud concentration in artificial seawater.

  7. Drill pipe corrosion control using an inert drilling fluid

    SciTech Connect

    Caskey, B.C.; Copass, K.S.

    1981-01-01

    The results of a geothermal drill pipe corrosion field test are presented. When a low-density drilling fluid was required for drilling a geothermal well because of an underpressured, fractured formation, two drilling fluids were alternately used to compare drill pipe corrosion rates. The first fluid was an air-water mist with corrosion control chemicals. The other fluid was a nitrogen-water mist without added chemicals. The test was conducted during November 1980 at the Baca Location in northern New Mexico. Data from corrosion rings, corrosion probes, fluid samples and flow line instrumentation are plotted for the ten day test period. It is shown that the inert drilling fluid, nitrogen, reduced corrosion rates by more than an order of magnitude. Test setup and procedures are also discussed. Development of an onsite inert gas generator could reduce the cost of drilling geothermal wells by extending drill pipe life and reducing corrosion control chemical costs.

  8. Drill Pipe Corrosion Control Using an Inert Drilling Fluid

    SciTech Connect

    Caskey, B. C.; Copass, K. S.

    1981-01-01

    The results of a geothermal drill pipe corrosion field test are presented. When a low-density drilling fluid was required for drilling a geothermal well because of an underpressured, fractured formation, two drilling fluids were alternately used to compare drill pipe corrosion rates. The first fluid was an air-water mist with corrosion control chemicals. The other fluid was a nitrogen-water mist without added chemicals. The test was conducted during November 1980 at the Baca location in northern New Mexico. Data from corrosion rings, corrosion probes, fluid samples and flow line instrumentation are plotted for the ten day test period. it is shown that the inert drilling fluid, nitrogen, reduced corrosion rates by more than an order of magnitude. Test setup and procedures are also discussed.

  9. Analysis of drilling fluid rheology and tool joint effect to reduce errors in hydraulics calculations

    E-print Network

    Viloria Ochoa, Marilyn

    2006-10-30

    .........................................................................45 V HYDRAULICS ....................................................................................49 5.1 Friction Pressure Loss Calculation..........................................50 VI TOOL JOINT... with synthetic- based mud (SBM) can be off as much as 35%.2 The possible reasons could be that friction pressure losses are functions of drilling fluid properties, which are functions of the rheological model, temperature, and well geometry.3 As a result...

  10. Method for preventing fluid loss during drilling

    Microsoft Academic Search

    Cremeans

    1980-01-01

    A method is disclosed for preventing loss of aqueous drilling fluid to porous formations penetrated by a well bore during drilling operations for oil and gas. The method utilizes readily available pelleted cottonseed hulls as the lost circulation material which is added to the drilling fluid and pumped down the well bore. The pelleted cottonseed hulls are composed of cottonseed

  11. DEVELOPMENT OF NEW DRILLING FLUIDS

    SciTech Connect

    David B. Burnett

    2003-08-01

    The goal of the project has been to develop new types of drill-in fluids (DIFs) and completion fluids (CFs) for use in natural gas reservoirs. Phase 1 of the project was a 24-month study to develop the concept of advanced type of fluids usable in well completions. Phase 1 tested this concept and created a kinetic mathematical model to accurately track the fluid's behavior under downhole conditions. Phase 2 includes tests of the new materials and practices. Work includes the preparation of new materials and the deployment of the new fluids and new practices to the field. The project addresses the special problem of formation damage issues related to the use of CFs and DIFs in open hole horizontal well completions. The concept of a ''removable filtercake'' has, as its basis, a mechanism to initiate or trigger the removal process. Our approach to developing such a mechanism is to identify the components of the filtercake and measure the change in the characteristics of these components when certain cleanup (filtercake removal) techniques are employed.

  12. DRILL-STRING NONLINEAR DYNAMICS ACCOUNTING FOR DRILLING FLUID T. G. Ritto

    E-print Network

    Boyer, Edmond

    ;1. INTRODUCTION A drill-string is a slender structure used in oil wells to penetrate the soil in search of oilDRILL-STRING NONLINEAR DYNAMICS ACCOUNTING FOR DRILLING FLUID T. G. Ritto R. Sampaio thiagoritto Descartes, 77454 Marne-la-Vallée, France Abstract. The influence of the drilling fluid (or mud) on the drill

  13. 30 CFR 250.457 - What equipment is required to monitor drilling fluids?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...equipment is required to monitor drilling fluids? 250.457 Section 250.457...Gas Drilling Operations Drilling Fluid Requirements § 250.457 What equipment is required to monitor drilling fluids? Once you establish drilling...

  14. 30 CFR 250.457 - What equipment is required to monitor drilling fluids?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...equipment is required to monitor drilling fluids? 250.457 Section 250.457...Gas Drilling Operations Drilling Fluid Requirements § 250.457 What equipment is required to monitor drilling fluids? Once you establish drilling...

  15. 30 CFR 250.457 - What equipment is required to monitor drilling fluids?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...equipment is required to monitor drilling fluids? 250.457 Section 250.457...Gas Drilling Operations Drilling Fluid Requirements § 250.457 What equipment is required to monitor drilling fluids? Once you establish drilling...

  16. 30 CFR 250.457 - What equipment is required to monitor drilling fluids?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...equipment is required to monitor drilling fluids? 250.457 Section 250.457...Gas Drilling Operations Drilling Fluid Requirements § 250.457 What equipment is required to monitor drilling fluids? Once you establish drilling...

  17. 30 CFR 250.457 - What equipment is required to monitor drilling fluids?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...equipment is required to monitor drilling fluids? 250.457 Section 250.457...Gas Drilling Operations Drilling Fluid Requirements § 250.457 What equipment is required to monitor drilling fluids? Once you establish drilling...

  18. Rheological study of a water based oil well drilling fluid

    Microsoft Academic Search

    Vikas Mahto; V. P. Sharma

    2004-01-01

    Organic polymers are commonly used to control the rheology and filtrate loss required for water-based drilling fluids. An ecologically-friendly water-based drilling fluid was developed by studying the rheological behavior of tamarind gum and polyanionic cellulose on bentonite water suspensions. The effect of drilling fluid filtrate on formation damage was also analyzed. The drilling fluid that was developed has better rheological

  19. POTENTIAL IMPACT OF DRILLING FLUIDS ON ESTUARINE PRODUCTIVITY

    EPA Science Inventory

    This paper discusses the potential effects of drilling fluids on semienclosed bodies of water such as estuaries. Drilling fluids have been discharged into outer continental shelf waters for many years but there is some concern of potential ecological impact when drilling fluids a...

  20. Recent Developments in Geothermal Drilling Fluids

    SciTech Connect

    Kelsey, J. R.; Rand, P. B.; Nevins, M. J.; Clements, W. R.; Hilscher, L. W.; Remont, L. J.; Matula, G. W.; Balley, D. N.

    1981-01-01

    In the past, standard drilling muds have been used to drill most geothermal wells. However, the harsh thermal and chemical environment and the unique geothermal formations have led to such problems as excessive thickening of the fluid, formation damage, and lost circulation. This paper describes three recent development efforts aimed at solving some of these drilling fluid problems. Each of the efforts is at a different stage of development. The Sandia aqueous foam studies are still in the laboratory phase, NL Baroid's polymeric deflocculant is soon to be field tested, and the Mudtech high-temperature mud was field tested several months ago. Low density and the capability to suspend particles at low relative velocities are two factors which make foam an attractive drilling fluid. The stability of these foams and their material properties at high temperatures are presently unknown and this lack of information has precluded their use as a geothermal drilling fluid. The aqueous foam studies being conducted at Sandia are aimed at screening available surfactants for temperature and chemical stability. Approximately 100 surfactants have been tested at temperatures of 260 and 310 C (500 and 590 F), and several of these candidates appear very promising. NL Baroid has developed a polymeric deflocculant for water-based muds which shows promise in retarding thermal degradation effects and associated gelation. Formulations containing this new polymer have shown good rheological properties up to 260 C (500 F) in laboratory testing. A high-temperature mud consisting primarily of sepiolite, bentonite, and brown coal has been developed by Mudtech, Inc. A field test of this mud was conducted in a geothermal well in the Imperial Valley of California in May 1980. The fluid exhibited good hole-cleaning characteristics and good rheological properties throughout the test.

  1. Use of an inert drilling fluid to control geothermal drill pipe corrosion

    SciTech Connect

    Caskey, B.C.

    1981-04-01

    The results of a geothermal drill pipe corrosion field test are presented. When a low-density drilling fluid was required for drilling a geothermal well because of an underpressured, fractured formation, two drilling fluids were alternatively used to compare drill pipe corrosion rates. The first fluid was an air-water mist with corrosion control chemicals. The other fluid was a nitrogen-water mist without added chemicals. The test was conducted during November 1980 at the Baca Location in northern New Mexico, USA. Data from corrosion rings, corrosion probes, fluid samples, and flow line instrumentation are plotted for the ten day test period. It is shown that the inert drilling fluid (nitrogen) reduced corrosion rates by more than an order of magnitude. Test setup and procedures are also discussed. Development of an on-site inert gas generator could reduce the cost of drilling geothermal wells by extending drill pipe life and reducing corrosion control chemical costs.

  2. PREDICTION OF CUTTINGS BED HEIGHT WITH COMPUTATIONAL FLUID DYNAMICS IN DRILLING HORIZONTAL AND HIGHLY DEVIATED WELLS

    E-print Network

    Ullmer, Brygg

    PREDICTION OF CUTTINGS BED HEIGHT WITH COMPUTATIONAL FLUID DYNAMICS IN DRILLING HORIZONTAL Computational Fluid Dynamics methods. Movement, concentration and accumulation of drilled cuttings in non parameters such as wellbore geometry, pump rate, drilling fluid rheology and density, and maximum drilling

  3. 30 CFR 250.455 - What are the general requirements for a drilling fluid program?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...the general requirements for a drilling fluid program? 250.455 Section 250.455...and Gas Drilling Operations Drilling Fluid Requirements § 250.455 What are the general requirements for a drilling fluid program? You must design and...

  4. 30 CFR 250.455 - What are the general requirements for a drilling fluid program?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...the general requirements for a drilling fluid program? 250.455 Section 250.455...and Gas Drilling Operations Drilling Fluid Requirements § 250.455 What are the general requirements for a drilling fluid program? You must design and...

  5. 30 CFR 250.459 - What are the safety requirements for drilling fluid-handling areas?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...the safety requirements for drilling fluid-handling areas? 250.459 Section...and Gas Drilling Operations Drilling Fluid Requirements § 250.459 What are the safety requirements for drilling fluid-handling areas? You must...

  6. 30 CFR 250.458 - What quantities of drilling fluids are required?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...2012-07-01 false What quantities of drilling fluids are required? 250.458 Section 250...Oil and Gas Drilling Operations Drilling Fluid Requirements § 250.458 What quantities of drilling fluids are required? (a) You must...

  7. 30 CFR 250.459 - What are the safety requirements for drilling fluid-handling areas?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...the safety requirements for drilling fluid-handling areas? 250.459 Section...and Gas Drilling Operations Drilling Fluid Requirements § 250.459 What are the safety requirements for drilling fluid-handling areas? You must...

  8. 30 CFR 250.459 - What are the safety requirements for drilling fluid-handling areas?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...the safety requirements for drilling fluid-handling areas? 250.459 Section...and Gas Drilling Operations Drilling Fluid Requirements § 250.459 What are the safety requirements for drilling fluid-handling areas? You must...

  9. 30 CFR 250.455 - What are the general requirements for a drilling fluid program?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...the general requirements for a drilling fluid program? 250.455 Section 250.455...and Gas Drilling Operations Drilling Fluid Requirements § 250.455 What are the general requirements for a drilling fluid program? You must design and...

  10. 30 CFR 250.455 - What are the general requirements for a drilling fluid program?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...the general requirements for a drilling fluid program? 250.455 Section 250.455...and Gas Drilling Operations Drilling Fluid Requirements § 250.455 What are the general requirements for a drilling fluid program? You must design and...

  11. 30 CFR 250.459 - What are the safety requirements for drilling fluid-handling areas?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...the safety requirements for drilling fluid-handling areas? 250.459 Section...and Gas Drilling Operations Drilling Fluid Requirements § 250.459 What are the safety requirements for drilling fluid-handling areas? You must...

  12. 30 CFR 250.458 - What quantities of drilling fluids are required?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...2014-07-01 false What quantities of drilling fluids are required? 250.458 Section 250...Oil and Gas Drilling Operations Drilling Fluid Requirements § 250.458 What quantities of drilling fluids are required? (a) You must...

  13. 30 CFR 250.458 - What quantities of drilling fluids are required?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...2010-07-01 false What quantities of drilling fluids are required? 250.458 Section 250...Oil and Gas Drilling Operations Drilling Fluid Requirements § 250.458 What quantities of drilling fluids are required? (a) You must...

  14. 30 CFR 250.458 - What quantities of drilling fluids are required?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...2011-07-01 false What quantities of drilling fluids are required? 250.458 Section 250...and Gas Drilling Operations Drilling Fluid Requirements § 250.458 What quantities of drilling fluids are required? (a) You must...

  15. 30 CFR 250.459 - What are the safety requirements for drilling fluid-handling areas?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...the safety requirements for drilling fluid-handling areas? 250.459 Section...and Gas Drilling Operations Drilling Fluid Requirements § 250.459 What are the safety requirements for drilling fluid-handling areas? You must...

  16. 30 CFR 250.455 - What are the general requirements for a drilling fluid program?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...the general requirements for a drilling fluid program? 250.455 Section 250.455...Oil and Gas Drilling Operations Drilling Fluid Requirements § 250.455 What are the general requirements for a drilling fluid program? You must design and...

  17. 30 CFR 250.458 - What quantities of drilling fluids are required?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...2013-07-01 false What quantities of drilling fluids are required? 250.458 Section 250...Oil and Gas Drilling Operations Drilling Fluid Requirements § 250.458 What quantities of drilling fluids are required? (a) You must...

  18. Second-Generation Synthetic Drilling Fluids

    Microsoft Academic Search

    J. E. Friedheim

    1997-01-01

    At the start of the 1990`s, three synthetic materials were introduced: esters, ethers, and polyalphaolefins (PAO`s). Now heading toward the last half of this decade, a new generation of synthetics is gaining popularity--linear alpha olefins (LAO`s), internal or isomerized olefins (IO`s), and linear paraffins (LP`s). While similar, they also have differences, both as base fluids and as formulated drilling muds.

  19. Research and application of amphoteric polymers for drilling fluid

    SciTech Connect

    Niu Yabin; Zhang Daming [Scientific Research Inst. of Petroleum Exploration and Development, Beijing (China); Luo Pingya; Li Jian; Xu Tongtai

    1995-11-01

    As the inhibition ability is not strong enough and the tolerance ability of solid contamination is low for the usual polymer drilling fluids, the amphoteric polymer drilling fluid is suggested to solve these problems after analyzing and researching interactive mechanisms and components of polymer drilling fluid as well as structure character of polymer molecule. The application in 15 oilfields (nearly 4,000 wells) in China demonstrates that the amphoteric polymer drilling fluid has strong inhibition, can retard ``mud-making`` of shale formation, keeps low-solid content and is wellbore stable. The amphoteric polymer drilling fluid has excellent rheological properties to make full use of jet-bit drilling and achieve significantly increased drilling rates. The obvious results in the protection of oil formation have been achieved.

  20. Effect of drilling fluids on permeability of uranium sandstone

    Microsoft Academic Search

    J. K. Ahlness; D. I. Johnson; D. R. Tweeton

    1984-01-01

    The Bureau of Mines conducted laboratory and field experiments to determine the amount of permeability reduction in uranium sandstone after its exposure to different drilling fluids. Seven polymer and two bentonite fluids were laboratory-tested in their clean condition, and six polymer fluids were tested with simulated drill cuttings added. Sandstone cores cut from samples collected at an open pit uranium

  1. State-of-the-art in coalbed methane drilling fluids

    SciTech Connect

    Baltoiu, L.V.; Warren, B.K.; Natras, T.A.

    2008-09-15

    The production of methane from wet coalbeds is often associated with the production of significant amounts of water. While producing water is necessary to desorb the methane from the coal, the damage from the drilling fluids used is difficult to assess, because the gas production follows weeks to months after the well is drilled. Commonly asked questions include the following: What are the important parameters for drilling an organic reservoir rock that is both the source and the trap for the methane? Has the drilling fluid affected the gas production? Are the cleats plugged? Does the 'filtercake' have an impact on the flow of water and gas? Are stimulation techniques compatible with the drilling fluids used? This paper describes the development of a unique drilling fluid to drill coalbed methane wells with a special emphasis on horizontal applications. The fluid design incorporates products to match the delicate surface chemistry on the coal, a matting system to provide both borehole stability and minimize fluid losses to the cleats, and a breaker method of removing the matting system once drilling is completed. This paper also discusses how coal geology impacts drilling planning, drilling practices, the choice of drilling fluid, and completion/stimulation techniques for Upper Cretaceous Mannville-type coals drilled within the Western Canadian Sedimentary Basin. A focus on horizontal coalbed methane (CBM) wells is presented. Field results from three horizontal wells are discussed, two of which were drilled with the new drilling fluid system. The wells demonstrated exceptional stability in coal for lengths to 1000 m, controlled drilling rates and ease of running slotted liners. Methods for, and results of, placing the breaker in the horizontal wells are covered in depth.

  2. The development and field testing of a less hazardous and technically superior oil based drilling fluid

    SciTech Connect

    Kenny, P.; Norman, M.; Friestad, A.M.; Risvik, B.

    1996-12-31

    This paper describes the development and subsequent field results of a new invert emulsion, low toxicity, oil based drilling fluid (LTOBM). The new fluid was developed in response to the anticipated increased usage of LTOBM, and primary considerations in the development were those of working conditions, the environment, technical performance and economics. Developments in invert emulsion drilling fluids have, over recent years, been concentrated in the areas of reducing environmental impact, and improving technical performance. LTOBM have, as a result of this, been largely replaced by synthetic based drilling fluids (SBM), which exhibit similar, or improved technical performance, whilst claiming to have reduced environmental impact. This development focus has resulted in very few changes being made to LTOBM since the replacement of diesel by low toxicity mineral oil. The occupational health hazards involved in using SBM have, however, proven to be similar, or occasionally worse, than with LTOBM. Such health problems can be mainly attributed to two components; the base fluid and lime, the latter being a major contributor to skin irritation problems, and the former to both skin irritation, and inhalation problems. There has been a lack of occupational health studies carried out with respect to the use of SBM compared to LTOBM. This paper describes the laboratory testing conducted, and results obtained during the development, where several base fluids were screened, along with a multitude of fluid additives, prior to obtaining the optimal formulation. The final fluid was designed for use on high temperature high pressure wells and extended reach wells, as well as more {open_quotes}normal wells{close_quotes}. The laboratory data presented is supported by field data from the successful use of the system as a worker friendly, high performance, LTOBM drilling fluid.

  3. Tragacanth Gum: An Effective Oil Well Drilling Fluid Additive

    Microsoft Academic Search

    VIKAS MAHTO; V. P. SHARMA

    2005-01-01

    The low penetration rate, excessive torque and drag, poor hole cleaning and formation damage are major impediments in drilling oil and gas wells. These have a major impact on drilling efficiency and well economics. Keeping these in mind, an attempt was made to design a water based drilling fluid system using Indian bentonite clays and tragacanth gum. The effect of

  4. Soil properties affecting wheat yields following drilling-fluid application.

    PubMed

    Bauder, T A; Barbarick, K A; Ippolito, J A; Shanahan, J F; Ayers, P D

    2005-01-01

    Oil and gas drilling operations use drilling fluids (mud) to lubricate the drill bit and stem, transport formation cuttings to the surface, and seal off porous geologic formations. Following completion of the well, waste drilling fluid is often applied to cropland. We studied potential changes in soil compaction as indicated by cone penetration resistance, pH, electrical conductivity (EC(e)), sodium adsorption ratio (SAR), extractable soil and total straw and grain trace metal and nutrient concentrations, and winter wheat (Triticum aestivum L. 'TAM 107') grain yield following water-based, bentonitic drilling-fluid application (0-94 Mg ha(-1)) to field test plots. Three methods of application (normal, splash-plate, and spreader-bar) were used to study compaction effects. We measured increasing SAR, EC(e), and pH with drilling-fluid rates, but not to levels detrimental to crop production. Field measurements revealed significantly higher compaction within areas affected by truck travel, but also not enough to affect crop yield. In three of four site years, neither drilling-fluid rate nor application method affected grain yield. Extractions representing plant availability and plant analyses results indicated that drilling fluid did not significantly increase most trace elements or nutrient concentrations. These results support land application of water-based bentonitic drilling fluids as an acceptable practice on well-drained soils using controlled rates. PMID:16091622

  5. Effect of drilling fluids on permeability of uranium sandstone

    SciTech Connect

    Ahlness, J.K.; Johnson, D.I.; Tweeton, D.R.

    1984-01-01

    The Bureau of Mines conducted laboratory and field experiments to determine the amount of permeability reduction in uranium sandstone after its exposure to different drilling fluids. Seven polymer and two bentonite fluids were laboratory-tested in their clean condition, and six polymer fluids were tested with simulated drill cuttings added. Sandstone cores cut from samples collected at an open pit uranium mine were the test medium. The clean fluid that resulted in the least permeability reduction was an hydroxyethyl cellulose polymer fluid. The greatest permeability reduction of the clean polymers came from a shale-inhibiting synthetic polymer. Six polymer fluids were tested with simulated drill cuttings added to represent field use. The least permeability reduction was obtained from a multipolymer blend fluid. A field experiment was performed to compare how two polymer fluids affect formation permeability when used for drilling in situ uranium leaching wells. For this test, the polymer fluid with the best laboratory results (multipolymer blend) was compared with a commonly used polymer fluid (guar gum) that gave poorer laboratory results. When fluid injection rates for the four wells drilled with the guar gum were compared with those for the four drilled with the multipolymer blend, no statistically significant difference was found.

  6. Recent developments in geothermal drilling fluids

    SciTech Connect

    Kelsey, J.R.; Rand, P.B.; Nevins, M.J.; Clements, W.R.; Hilscher, L.W.; Remont, L.J.; Matula, G.W.; Bailey, D.N.

    1981-01-01

    Three recent development efforts are described, aimed at solving some of these drilling fluid problems. The Sandia aqueous foam studies are still in the laboratory phase; NL Baroid's polymeric deflocculant is being field tested; and the Mudtech high temperature mud was field tested several months ago. The aqueous foam studies are aimed at screening available surfactants for temperture and chemical stability. Approximately 100 surfactants have been tested at temperatures of 260/sup 0/C and 310/sup 0/C and several of these candidates appear very promising. A polymeric deflocculant was developed for water-based muds which shows promise in laboratory tests of retarding thermal degradation effects and associated gelation. Formulations containing this new polymer have shown good rheological properties up to 500/sup 0/F. A high temperature mud consisting primarily of sepiolite, bentonite, and brown coal has been developed. A field test of this mud was conducted in a geothermal well in the Imperial Valley of California in May of last year. The fluid exhibited good hole-cleaning characteristics and good rheological properties throughout the test. (MHR)

  7. Effects of a drilling fluid on the development of a teleost and an echinoderm

    Microsoft Academic Search

    Richard B. Crawford; Jonathan D. Gates

    1981-01-01

    Offshore petroleum drilling operations introduce large quantities of drilling fluids (muds) into the marine environment. These drilling fluids are aqueous suspensions of various compositions pumped down the center of the drill bit. They provide the drilling process with lubrication, a suspending medium for the chips of material being drilled through, cooling, antibacterial action, protection against loss of oil or gas,

  8. Drilling fluid containing a copolymer filtration control agent

    SciTech Connect

    Lucas, J. M.

    1985-10-15

    The invention relates to an aqueous drilling fluid composition, a filtration control agent for utilization in said aqueous drilling fluid, and a method of forming a filter cake on the wall of a well for the reduction of filtrate from said drilling fluid, by utilization of a copolymer of: a (meth) acrylamido alkyl sulfonic acid or alkali metal salt thereof; and N, N-dialkyl (meth) acrylamide. The copolymer may be cross-linked with N,N'-methylenebisacrylamide or other appropriate cross-linking agent.

  9. Drilling fluid containing a copolymer filtration control agent

    SciTech Connect

    Enright, D.P.; Lucas, J.M.; Perricone, A.C.

    1981-10-06

    The invention relates to an aqueous drilling fluid composition, a filtration control agent for utilization in said aqueous drilling fluid, and a method of forming a filter cake on the wall of a well for the reduction of filtrate from said drilling fluid, by utilization of a copolymer of: (1) a (Meth) acrylamido alkyl sulfonic acid or alkali metal salt thereof; and (2) a (Meth) acrylamide or n-alkyl (Meth) acrylamide. The copolymer may be cross-linked with a quaternary ammonium salt cross-linking agent.

  10. Methods for Handling Drilled Gas in Oil-Based Drilling Fluids

    Microsoft Academic Search

    P. L. OBryan; A. T. Bourgoyne

    1989-01-01

    This paper presents calculation methods for predicting the behavior of drilled-gas contamination of oil-based drilling fluids. The methods are verified by experiments conducted in a 6,000-ft (1828.8 m) test well. This paper also presents field-handling procedures developed with the calculation methods.

  11. 40 CFR Appendix 8 to Subpart A of... - Reference C16-C18 Internal Olefin Drilling Fluid Formulation

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Reference C16-C18 Internal Olefin Drilling Fluid Formulation 8 Appendix 8 to Subpart...C16 -C18 Internal Olefin Drilling Fluid Formulation The reference C16 -C18 internal olefin drilling fluid used to determine the drilling...

  12. 40 CFR Appendix 8 to Subpart A of... - Reference C16-C18 Internal Olefin Drilling Fluid Formulation

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...Reference C16-C18 Internal Olefin Drilling Fluid Formulation 8 Appendix 8 to Subpart...C16 -C18 Internal Olefin Drilling Fluid Formulation The reference C16 -C18 internal olefin drilling fluid used to determine the drilling...

  13. 40 CFR Appendix 8 to Subpart A of... - Reference C16-C18 Internal Olefin Drilling Fluid Formulation

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Reference C16-C18 Internal Olefin Drilling Fluid Formulation 8 Appendix 8 to Subpart...C16 -C18 Internal Olefin Drilling Fluid Formulation The reference C16 -C18 internal olefin drilling fluid used to determine the drilling...

  14. 40 CFR Appendix 8 to Subpart A of... - Reference C16-C18 Internal Olefin Drilling Fluid Formulation

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...Reference C16-C18 Internal Olefin Drilling Fluid Formulation 8 Appendix 8 to Subpart...C16 -C18 Internal Olefin Drilling Fluid Formulation The reference C16 -C18 internal olefin drilling fluid used to determine the drilling...

  15. 40 CFR Appendix 8 to Subpart A of... - Reference C16-C18 Internal Olefin Drilling Fluid Formulation

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Reference C16-C18 Internal Olefin Drilling Fluid Formulation 8 Appendix 8 to Subpart...C16 -C18 Internal Olefin Drilling Fluid Formulation The reference C16 -C18 internal olefin drilling fluid used to determine the drilling...

  16. IMPACT OF DRILLING FLUIDS ON SEAGRASSES: AN EXPERIMENTAL COMMUNITY APPROACH

    EPA Science Inventory

    Effects of a used drilling fluid on an experimental seagrass community (Thalassia testudinum) were measured by exposing the community to the suspended particulate phase (SPP) in laboratory microcosms. Structure of the macroinvertebrate assemblage, growth and chlorophyll content o...

  17. Enhanced Wellbore Stabilization and Reservoir Productivity with Aphron Drilling Fluid Technology

    SciTech Connect

    Arkadiy Belkin; Fred Growcock

    2004-07-31

    The rate and amplitude of pressure transmission of various drilling fluids--particularly aphron drilling fluids--are measured in a long conduit and in sand packs to determine how pressure transmissibility can affect fluid invasion.

  18. Drilling fluids containing amps, acrylic acid, itaconic acid polymer

    SciTech Connect

    Bardoliwalla, D.F.

    1987-10-13

    This patent describes an aqueous drilling fluid having present in an amount sufficient to reduce fluid loss of the drilling fluid, at least one polymer of (1) from about 5% to about 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid and (2) from about 95% to about 50% by weight of a second component, there being from 100% to about 80% by weight of acrylic acid and from 0% by weight to about 20% by weight of itaconic acid in the second component. The polymer has a weight average molecular weight of between about 50,000 to about 1,000,000 being in its free acid or partially or completely neutralized form and being at least water dispersible. A method is described of drilling a well into a subterranean formation in which an aqueous drilling fluid is circulated into the well. The step of circulating the drilling fluid contains in an amount sufficient to reduce fluid loss of the drilling fluid, at least one polymer of (1) from about 5% to about 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid and (2) from about 95% to about 50% by weight of a second component. There is from 100% to about 80% by weight of acrylic acid and from 0% by weight to about 20% by weight of itaconic acid in the second component. The polymer has weight average molecular weight of between about 50,000 to about 1,000,000 in its free acid or partially or completely neutralized form and is at least water dispersible.

  19. Polycyclic aromatic hydrocarbons profiles of spent drilling fluids deposited at Emu-Uno, Delta State, Nigeria.

    PubMed

    Iwegbue, Chukwujindu M A

    2011-10-01

    The concentrations and profiles of polycyclic aromatic hydrocarbons were determined in spent drilling fluid deposited at Emu-Uno, Delta State of Nigeria. The total concentrations of polycyclic aromatic hydrocarbons in the spent drilling fluid deposits ranged between 40 and 770 ?g kg(-1). The PAHs profile were predominantly 2- and 3-rings with acenaphthalene, phenanthrene, fluorene being the predominant PAHs. The prevalence of 2- and 3-rings PAHs in the spent drilling fluid deposits indicate contamination of the drilling fluids with crude oil during drilling. Incorporation of spent drilling fluids into the soil has serious implication for soil, surface water and groundwater quality. PMID:21809098

  20. AN EXPERIMENTAL STUDY OF CUTTING FLUID EFFECTS IN DRILLING. (R825370C057)

    EPA Science Inventory

    Experiments were designed and conducted on aluminum alloys and gray cast iron to determine the function of cutting fluid in drilling. The variables examined included speed, feed, hole depth, tool and workpiece material, cutting fluid condition, workpiece temperatures and drill...

  1. Selective placement disposal of drilling fluids in west Texas

    Microsoft Academic Search

    McFarland

    1988-01-01

    Burial of spent drilling fluids used in petroleum and natural gas exploration was evaluated as an alternative disposal technique for reducing surface soil contamination in western Texas. Simulated reserve pits were constructed to provide burial depths of 30, 90, and 150 cm below the surface, with orderly replacement of stockpiled subsoil and topsoil. Movement of soluble salts and heavy metals

  2. WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS

    Microsoft Academic Search

    Jill S. Buckley; Norman R. Morrow

    2004-01-01

    We report on progress in three areas. In part one, the wetting effects of synthetic base oils are reported. Part two reports progress in understanding the effects of surfactants of known chemical structures, and part three integrates the results from surface and core tests that show the wetting effects of commercial surfactant products used in synthetic and traditional oil-based drilling

  3. Clay-based geothermal drilling fluids

    SciTech Connect

    Guven, N.; Carney, L.L.; Lee, L.J.; Bernhard, R.P.

    1982-11-01

    The rheological properties of fluids based on fibrous clays such as sepiolite and attapulgite have been systematically examined under conditions similar to those of geothermal wells, i.e. at elevated temperatures and pressures in environments with concentrated brines. Attapulgite- and sepiolite-based fluids have been autoclaved at temperatures in the range from 70 to 800/sup 0/F with the addition of chlorides and hydroxides of Na, K, Ca, and Mg. The rheological properties (apparent and plastic viscosity, fluid loss, gel strength, yield point, and cake thickness) of the autoclaved fluids have been studied and correlated with the chemical and physical changes that occur in the clay minerals during the autoclaving process.

  4. Unique microbial community in drilling fluids from Chinese continental scientific drilling

    USGS Publications Warehouse

    Zhang, G.; Dong, H.; Jiang, H.; Xu, Z.; Eberl, D.D.

    2006-01-01

    Circulating drilling fluid is often regarded as a contamination source in investigations of subsurface microbiology. However, it also provides an opportunity to sample geological fluids at depth and to study contained microbial communities. During our study of deep subsurface microbiology of the Chinese Continental Scientific Deep drilling project, we collected 6 drilling fluid samples from a borehole from 2290 to 3350 m below the land surface. Microbial communities in these samples were characterized with cultivation-dependent and -independent techniques. Characterization of 16S rRNA genes indicated that the bacterial clone sequences related to Firmicutes became progressively dominant with increasing depth. Most sequences were related to anaerobic, thermophilic, halophilic or alkaliphilic bacteria. These habitats were consistent with the measured geochemical characteristics of the drilling fluids that have incorporated geological fluids and partly reflected the in-situ conditions. Several clone types were closely related to Thermoanaerobacter ethanolicus, Caldicellulosiruptor lactoaceticus, and Anaerobranca gottschalkii, an anaerobic metal-reducer, an extreme thermophile, and an anaerobic chemoorganotroph, respectively, with an optimal growth temperature of 50-68??C. Seven anaerobic, thermophilic Fe(III)-reducing bacterial isolates were obtained and they were capable of reducing iron oxide and clay minerals to produce siderite, vivianite, and illite. The archaeal diversity was low. Most archaeal sequences were not related to any known cultivated species, but rather to environmental clone sequences recovered from subsurface environments. We infer that the detected microbes were derived from geological fluids at depth and their growth habitats reflected the deep subsurface conditions. These findings have important implications for microbial survival and their ecological functions in the deep subsurface.

  5. An Industry/DOE Program to Develop and Benchmark Advanced Diamond Product Drill Bits and HP/HT Drilling Fluids to Significantly Improve Rates of Penetration

    SciTech Connect

    TerraTek

    2007-06-30

    A deep drilling research program titled 'An Industry/DOE Program to Develop and Benchmark Advanced Diamond Product Drill Bits and HP/HT Drilling Fluids to Significantly Improve Rates of Penetration' was conducted at TerraTek's Drilling and Completions Laboratory. Drilling tests were run to simulate deep drilling by using high bore pressures and high confining and overburden stresses. The purpose of this testing was to gain insight into practices that would improve rates of penetration and mechanical specific energy while drilling under high pressure conditions. Thirty-seven test series were run utilizing a variety of drilling parameters which allowed analysis of the performance of drill bits and drilling fluids. Five different drill bit types or styles were tested: four-bladed polycrystalline diamond compact (PDC), 7-bladed PDC in regular and long profile, roller-cone, and impregnated. There were three different rock types used to simulate deep formations: Mancos shale, Carthage marble, and Crab Orchard sandstone. The testing also analyzed various drilling fluids and the extent to which they improved drilling. The PDC drill bits provided the best performance overall. The impregnated and tungsten carbide insert roller-cone drill bits performed poorly under the conditions chosen. The cesium formate drilling fluid outperformed all other drilling muds when drilling in the Carthage marble and Mancos shale with PDC drill bits. The oil base drilling fluid with manganese tetroxide weighting material provided the best performance when drilling the Crab Orchard sandstone.

  6. Well drilling, workover and completion fluids

    Microsoft Academic Search

    Mondshine

    1986-01-01

    This patent describes a well treating fluid comprising: a. an aqueous suspension medium comprising an electrolyte solution having a density in the range from about 1.0 g\\/cm³ to about 1.2 g\\/cm³; b. a bridging agent; and c. a viscosifier and suspension additive in the amount of about 0.5 kg\\/m³ to about 14 kg\\/m³. The improvement described here comprises: utilizing as

  7. Method of providing a fluid seal in downhole drilling apparatus

    SciTech Connect

    Beimgraben, H. W.

    1984-10-16

    A method of drilling a subterranean well utilizing a downhole drilling apparatus is disclosed. The apparatus has a driven rotary drive shaft and a relatively fixed tubular housing circumjacent the drive shaft, with the housing having an annular upwardly facing bearing surface at an angle to a longitudinal axis of the housing and an annular sealing surface facing downwardly at an angle to the axis and axially spaced above the upwardly facing bearing surface. The method includes the steps of securing the drilling apparatus to the lower end of a string of drill pipes suspended in the well with the longitudinal axis of the housing coincident with the longitudinal axis of the string of drill pipe. Thereafter, the drill bit is secured to the lower end of the drive shaft, and fluid is pumped through the drilling apparatus to rotate the drive shaft and the bit. A rotating bearing and sealing device is positioned and secured relative to the drive shaft remotely within the well and axially between the spaced-apart annular bearing surface and annular sealing surface, with the rotating bearing and sealing device having a lower annular surface bearing upon and in face-to-face contact with the upwardly facing bearing surface and having an upper annular surface biased upwardly against the annular sealing surface in face-to-face contact therewith, whereby the axially spaced-apart pairs of annular surfaces provided a seal between the shaft area within the downhole apparatus and that area radially external of said bearing and sealing surface.

  8. Aqueous foam surfactants for geothermal drilling fluids: 1. Screening

    SciTech Connect

    Rand, P.B.

    1980-01-01

    Aqueous foam is a promising drilling fluid for geothermal wells because it will minimize damage to the producing formation and would eliminate the erosion problems of air drilling. Successful use of aqueous foam will require a high foaming surfactant which will: (1) be chemically stable in the harsh thermal and chemical environment, and (2) form stable foams at high temperatures and pressures. The procedures developed to generate and test aqueous foams and the effects of a 260/sup 0/C temperature cycle on aqueous surfactant solutions are presented. More than fifty selected surfactants were evaluated with representatives from the amphoteric, anionic, cationic, and nonionic classes included. Most surfactants were severely degraded by this temperature cycle; however, some showed excellent retention of their properties. The most promising surfactant types were the alkyl and alkyl aryl sulfonates and the ethoxylated nonionics.

  9. Effect of drilling fluids on permeability of uranium sandstone. Report of Investigations\\/1984

    Microsoft Academic Search

    J. K. Ahlness; D. I. Johnson; D. R. Tweeton

    1984-01-01

    The Bureau of Mines conducted laboratory and field experiments to determine the amount of permeability reduction in uranium sandstone after its exposure to different drilling fluids. Seven polymer and two bentonite fluids were laboratory-tested in their clean condition, and six polymer fluids were tested with simulated drill cuttings added. Sandstone cores cut from samples collected at an open pit uranium

  10. 30 CFR 250.456 - What safe practices must the drilling fluid program follow?

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...throughout the drilling of the well; (h) Before pulling drill-stem test tools from the hole, you must circulate or reverse-circulate...not feasible, you may bullhead test fluids out of the drill-stem test string and tools with an appropriate kill weight...

  11. GFDI COLLOQUIUM "Use of Mineral vs. Polymer Drilling Fluids in Deep

    E-print Network

    Ronquist, Fredrik

    GFDI COLLOQUIUM Title "Use of Mineral vs. Polymer Drilling Fluids in Deep Foundation Construction. Refreshments will be served at 1:30M ABSTRACT: In deep foundation design, drilled shafts (also referred to as bored piles or drilled caissons) are preferred because of their large load capacities and greater

  12. Evaluation of ilmenite as weight material in drilling fluids

    SciTech Connect

    Blomberg, N.E.; Aarrestad, S.; Boe, A.; Jacobsen, E.A.; Melberg, B.

    1982-09-01

    This paper discusses the prospect of using ilmenite as weight material in drilling fluids. The discussion is based on two field tests and laboratory experiments. Flow induced abrasion was found to be a considerable problem in the field tests using ilmenite as weight material. The abrasiveness was highly dependent on the particle size distribution, and the experiments clearly showed that the abrasiveness of ilmenite can be reduced to that of standard barite by removing the largest ilmenite particles. From experimental results, the authors recommend the particle size distribution of ilemenite to contain less than 3.0% above 45 ..mu..m. The field tests also demonstrated problems with dust, dispersion of ilmenite in water, air entrainment and foaming, which, as found by laboratory investigations, can be eliminated by reducing the content of flotation chemicals. Based on the field tests and the subsequent laboratory studies, the authors conclude that ilmenite is well suited for use as weight material in drilling fluids since the presently observed disadvantages to a large extent can be eliminated.

  13. Use of Tracers To Investigate Drilling-Fluid Invasion and Oil Flushing During Coring

    Microsoft Academic Search

    A. Brown; F. T. Marriott

    1988-01-01

    This work develops a method in which chemical tracers in the drilling fluid help determine mud filtrate invasion and the degree of oil flushing during coring of steamed and unsteamed heavy-oil formations. Salts of iodide and bromide were added to the drilling fluid while Well TO3 was cored through the Lombardi and Aurignac zones at San Ardo field in California.

  14. An Experimental Study of Gas Solubility in Oil-Based Drilling Fluids

    Microsoft Academic Search

    Patrick OBryan; Teresa Monger; Debra Kopcso

    1988-01-01

    Experimental data are provided for the solubility of Câ, Câ, COâ, and a natural gas mixture in base oils and emulsifier used to prepare oil-based drilling fluids over a range of temperatures. In addition, an empirical correlation for predicting gas solubility in oil-based drilling fluids at low to moderate pressures is presented and a field application is outlined.

  15. SYNTHETIC-BASED DRILLING FLUIDS: AN ASSESSMENT OF THE SPATIAL DISTRIBUTION OF TOXICANTS IN SEDIMENTS FROM GULF OF MEXICO DRILLING PLATFORMS

    EPA Science Inventory

    Use of the amphipods, Leptocheirus plumulosus and Ampelisca abdita, in these bioassays presented no major difficulties in the execution of these test protocols. Sensitivity to the toxicants was exhibited by L. plumulosus and survival of control animals was good suggesting the sui...

  16. WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS

    SciTech Connect

    Jill S. Buckley; Norman R. Morrow

    2003-10-01

    In this report we focus on surface studies of the wetting effects of SBM components; three areas of research are covered. First we present results of tests of interfacial properties of some commercial emulsifiers that are routinely used in both oil-based and synthetic oil-based drilling fluids. These products fall into two main groups, based on their CMC and IFT trends with changing pH. All can alter the wetting of mica, but measurements vary widely depending on the details of exposure and observation protocols. Non-equilibrium effects appear to be responsible for these variations, with equilibrated fluids generally giving lower contact angles than those observed with fluids that have not been pre-equilibrated. Addition of small amounts of emulsifier can increase the tendency of a crude oil to alter wetting of mica surfaces. The effects of similar amounts of these emulsifiers can be detected in interfacial tension measurements. Next, we report on the preliminary results of a study of polyethoxylated amines of varying structures on the wetting of mica surfaces. Contact angles have been measured for unequilibrated and pre-equilibrated fluids. Reduction in contact angles was generally observed when the surfaces were washed with toluene after exposure to surfactant solutions. Atomic forces microscopy is also being used to observe the interactions between these surfactants and mica surfaces. Finally, we show the results of a study of asphaltene stability in the presence of synthetic base oils. Most of the base oils in current use are paraffinic or olefinic--the aromatic content is minimized for environmental reasons--and they destabilize asphaltenes. Tests with two crude oils show onset conditions for base oils that are comparable to n-heptane and n-pentadecane in terms of the solubility conditions at the onset. Two ester-based products, Petrofree and Petrofree LV, did not cause asphaltene flocculation in these tests. A meeting of the research groups from New Mexico Tech and the University of Wyoming, was held in Laramie on the 9th and 10th of October. All the members of the research teams presented updates on their progress and exchanged views on directions for the remainder of the project.

  17. Hole-Cleaning Capabilities of Water and Oil-Based Drilling Fluids: A Comparative Experimental Study

    Microsoft Academic Search

    Terry Hemphill; T. I. Larsen

    1996-01-01

    Many laboratory studies evaluating the cuttings transport capabilities of water- and oil-based drilling fluids have been published, but few attempts have been made to investigate both fluid types under identical, controlled conditions. Those that considered both fluid types measured cuttings accumulation in the annulus and not fluid velocity. In this comparative study, the efficiency of water- and oil-based muds in

  18. Offshore Disposal of Oil-Based Drilling-Fluid Waste: An Environmentally Acceptable Solution

    Microsoft Academic Search

    Malachosky Ed; B. E. Shannon; J. E. Jackson; W. G. Aubert

    1993-01-01

    Oily cuttings and waste fluid are byproducts of oil-based drilling muds. In such difficult drilling environments as the Gulf of Mexico, where oil-based fluids often are preferred, personnel safety, environmental, and economic concerns are exacerbated by the necessity to transport these cuttings and fluids to shore for disposal. This paper describes a process for on-site preparation and subsequent disposal of

  19. Drilling fluid effects on crop growth and iron and zinc availability

    SciTech Connect

    Bauder, T.A.; Barbarick, K.A.; Ayers, P.D.; Chapman, P.L. [Colorado State Univ., Fort Collins, CO (United States); Shanahan, J.F. [Agricultural Research Service, Lincoln, NE (United States)

    1999-05-01

    Waste drilling fluids are often land-farmed following completion of an oil or gas well in Colorado. This material usually contains production water, bentonitic clays, formation cuttings, barite, Na compounds, and synthetic organic polymers. The authors investigated the effects of 5 to 60 dry g drilling fluid kg{sup {minus}1} soil on the growth and trace metal concentration of sorghum-sudangrass (Sorghum bicolor L. Moench DeKalb ST-6-S sudanense) in the greenhouse. A nonlinear regression exponential-rise model fit the increased plant total dry matter yield response to increasing drilling fluid rates. Increased plant tissue Fe concentration and uptake indicated that increased plant-available Fe was primarily responsible for the yield response, but increased Zn availability was also suspected. Results from a second greenhouse study confirmed that drilling fluid can also correct Zn deficiency in corn (Zea mays L.). Soil SAR (sodium adsorption ratio) was higher with increasing drilling fluid, but was still < 1. Other trace-element concentrations in sudangrass tissue and soil pH and EC{sub sat} were not significantly increased due to application of drilling fluid. This study showed that application of controlled rates of water-based drilling fluid from operations in Weld County, Colorado, was beneficial to the growth of sorghum-sudangrass and provided evidence that land application is an acceptable method of disposal.

  20. Optimization of Deep Drilling Performance - Development and Benchmark Testing of Advanced Diamond Product Drill Bits & HP/HT Fluids to Significantly Improve Rates of Penetration

    SciTech Connect

    Alan Black; Arnis Judzis

    2005-09-30

    This document details the progress to date on the OPTIMIZATION OF DEEP DRILLING PERFORMANCE--DEVELOPMENT AND BENCHMARK TESTING OF ADVANCED DIAMOND PRODUCT DRILL BITS AND HP/HT FLUIDS TO SIGNIFICANTLY IMPROVE RATES OF PENETRATION contract for the year starting October 2004 through September 2005. The industry cost shared program aims to benchmark drilling rates of penetration in selected simulated deep formations and to significantly improve ROP through a team development of aggressive diamond product drill bit--fluid system technologies. Overall the objectives are as follows: Phase 1--Benchmark ''best in class'' diamond and other product drilling bits and fluids and develop concepts for a next level of deep drilling performance; Phase 2--Develop advanced smart bit-fluid prototypes and test at large scale; and Phase 3--Field trial smart bit--fluid concepts, modify as necessary and commercialize products. As of report date, TerraTek has concluded all Phase 1 testing and is planning Phase 2 development.

  1. Heavy metals contribution of non-aqueous fluids used in offshore oil drilling

    Microsoft Academic Search

    Dirce Pozebon; Eder C. Lima; Sandra M. Maia; Jandyra M. G. Fachel

    2005-01-01

    A monitoring program was performed to investigate heavy metal content alteration due to exploratory drilling for oil using non-aqueous fluids (NAFs) in Brazilian offshore, 900m deep. Fourteen elements were monitored in 54 sites and it was verified that after drilling activities the average Ba concentration was remarkably increased with respect to background level, even 1 year after the activity. A

  2. Thermoporoelastic Effects of Drilling Fluid Temperature on Rock Drillability at Bit/Formation Interface

    E-print Network

    Thepchatri, Kritatee 1984-

    2012-10-26

    of the temperature difference between the drilling fluid and formation in a drilling operation. This study focuses on the thermal impacts at the bit/formation interface. The model applies the finite-difference method for the pore pressure and temperature solutions...

  3. Evaluation of ilmenite as weight material in drilling fluids

    SciTech Connect

    Blombery, N.E.; Aarestad, S.; Boe, S.; Jacobsen, E.; Melbery, B.

    1984-06-01

    This paper is based on field experiences from two wells and laboratory experiments. Flow-induced abrasion is a considerable problem in the field when ilmenite is used as weight material. In general, field observations are confirmed by laboratory experiments. However, the abrasiveness is highly dependent on the particle size distribution, and experiments clearly show that the abrasiveness of ilmenite can be reduced to that of standard barite by removing the largest ilmenite particles. From experimental results, the authors recommend that the size distribution of ilmenite contain fewer than 3% particles greater than 45 microns (45 ..mu..m). The use of ilmenite also demonstrated problems with dust, dispersion of ilmenite in water, air entrainment, and foaming, which, as found by laboratory investigations, can be eliminated by reducing the concentration of flotation chemicals. On the basis of field experience and subsequent laboratory studies, they conclude that ilmenite is well suited for use as weight material in drilling fluids since the presently observed disadvantages to a large extent can be diminished.

  4. ECOSYSTEM PERSPECTIVE ON POTENTIAL IMPACTS OF DRILLING FLUID DISCHARGES ON SEAGRASSES

    EPA Science Inventory

    Potential effects of oil drilling fluid discharges upon Thalassia seagrass ecosystems were examined to provide general insights and raise ecotoxicological issues relevant to problems of addressing a priori, ecolgical effects of anthropogenic actions. Microcosm experiments have de...

  5. IMPACT OF DRILLING FLUIDS ON SEAGRASSES: AN EXPERIMENTAL COMMUNITY APPROACH (JOURNAL VERSION)

    EPA Science Inventory

    Effects of a used drilling fluid on an experimental seagrass community (Thalassia testudinum Konig et Sims) were measured by exposing the community to the suspended particulate phase (SPP) in laboratory microcosms. Structure of the macroinvertebrate assemblage, growth and chlorop...

  6. Drilling Fluid Contamination during Riser Drilling Quantified by Chemical and Molecular Tracers

    NASA Astrophysics Data System (ADS)

    Inagaki, F.; Lever, M. A.; Morono, Y.; Hoshino, T.

    2012-12-01

    Stringent contamination controls are essential to any type of microbiological investigation, and are particularly challenging in ocean drilling, where samples are retrieved from hundreds of meters below the seafloor. In summer 2012, Integrated Ocean Drilling Expedition 337 aboard the Japanese vessel Chikyu pioneered the use of chemical tracers in riser drilling while exploring the microbial ecosystem of coalbeds 2 km below the seafloor off Shimokita, Japan. Contamination tests involving a perfluorocarbon tracer that had been successfully used during past riserless drilling expeditions were complemented by DNA-based contamination tests. In the latter, likely microbial contaminants were targeted via quantitative polymerase chain reaction assays using newly designed, group-specific primers. Target groups included potential indicators of (a) drilling mud viscosifiers (Xanthomonas, Halomonas), (b) anthropogenic wastewater (Bifidobacterium, Blautia, Methanobrevibacter), and (c) surface seawater (SAR 11, Marine Group I Archaea). These target groups were selected based on past evidence suggesting viscosifiers, wastewater, and seawater as the main sources of microbial contamination in cores retrieved by ocean drilling. Analyses of chemical and molecular tracers are in good agreement, and indicate microorganisms associated with mud viscosifiers as the main contaminants during riser drilling. These same molecular analyses are then extended to subseafloor samples obtained during riserless drilling operations. General strategies to further reduce the risk of microbial contamination during riser and riserless drilling operations are discussed.

  7. Research on drilling fluids and cement slurries at Standard Oil Production Company: an internship report 

    E-print Network

    Flipse, Eugene Charles, 1956-

    2013-03-13

    1986 Major Subject: Chemical Engineering Research on Drilling Fluids and Cement Slurries at Standard Oil Production Company An Internship Report by EUGENE CHARLES FLIPSE Dr. K. R. Hall Chairman, Advisory Committee Dr. A Juazis Internship... was assigned to the SOPC Drilling Fluids Laboratory during his internship. Dr. W. C. McMordie, Jr. was his direct supervisor. The technical and administrative duties of this internship fell into six categories: orientation, laboratory build-out, office...

  8. Surface and core wetting effects of surfactants in oil-based drilling fluids

    Microsoft Academic Search

    L. Skalli; J. S. Buckley; Y. Zhang; N. R. Morrow

    2006-01-01

    Surfactants are used in oil-based drilling fluids to emulsify water and to ensure that cuttings are wetted by oil. The products used are based on drilling conditions and are essentially the same for traditional oil-based and synthetic oil-based fluids. Although much of these surface active materials adsorb on cuttings and filter cake, it is still likely that core samples are

  9. Polycyclic Aromatic Hydrocarbons Profiles of Spent Drilling Fluids Deposited at Emu-Uno, Delta State, Nigeria

    Microsoft Academic Search

    Chukwujindu M. A. Iwegbue

    The concentrations and profiles of polycyclic aromatic hydrocarbons were determined in spent drilling fluid deposited at Emu-Uno,\\u000a Delta State of Nigeria. The total concentrations of polycyclic aromatic hydrocarbons in the spent drilling fluid deposits\\u000a ranged between 40 and 770 ?g kg?1. The PAHs profile were predominantly 2- and 3-rings with acenaphthalene, phenanthrene, fluorene being the predominant PAHs.\\u000a The prevalence of 2- and

  10. Method of providing a fluid seal in downhole drilling apparatus

    Microsoft Academic Search

    Beimgraben

    1984-01-01

    A method of drilling a subterranean well utilizing a downhole drilling apparatus is disclosed. The apparatus has a driven rotary drive shaft and a relatively fixed tubular housing circumjacent the drive shaft, with the housing having an annular upwardly facing bearing surface at an angle to a longitudinal axis of the housing and an annular sealing surface facing downwardly at

  11. EFFECTS OF DRILLING FLUIDS ON REEF CORALS: A REVIEW

    EPA Science Inventory

    This chapter reviews research on the effects of drilling mud on coral reef communities, concentrating on the major reef fauna: the reef-building or hermatypic corals. Drilling mud is an effluent introduced to the marine environment in large quantities during the typical offshore ...

  12. Borehole breakdown pressure with drilling fluids—I. Empirical results

    Microsoft Academic Search

    N. Morita; A. D. Black; G.-F. Fuh

    1996-01-01

    Mining and civil engineering industries sometimes use drilling muds for stabilizing a borehole during drilling wells for methane drainage, geothermal energy and radioactive waste disposal. Standard theories predicting borehole breakdown pressure assume breakdown occurs when a small fracture initiates at a location where the largest tangential stress at the borehole reaches the tensile strength of formation. Fracturing tests conducted in

  13. Drilling

    Microsoft Academic Search

    Kurt Walther; Mihael Brajdic; Welf Wawers

    \\u000a The non-contact and therefore wear-free drilling with laser radiation allows a high flexibility and the possibility for automatization.\\u000a A great variety of technical relevant materials like metals, alloys, high-strength materials, ceramics, multi layer systems,\\u000a semiconductors, carbon compounds, composites, diamond, or plastics can be drilled by laser radiation. Further advantages are\\u000a the reproducibility, the drilling velocity, and the achievable aspect ratio.

  14. OPTIMIZATION OF DEEP DRILLING PERFORMANCE--DEVELOPMENT AND BENCHMARK TESTING OF ADVANCED DIAMOND PRODUCT DRILL BITS & HP/HT FLUIDS TO SIGNIFICANTLY IMPROVE RATES OF PENETRATION

    SciTech Connect

    Alan Black; Arnis Judzis

    2004-10-01

    The industry cost shared program aims to benchmark drilling rates of penetration in selected simulated deep formations and to significantly improve ROP through a team development of aggressive diamond product drill bit--fluid system technologies. Overall the objectives are as follows: Phase 1--Benchmark ''best in class'' diamond and other product drilling bits and fluids and develop concepts for a next level of deep drilling performance; Phase 2--Develop advanced smart bit-fluid prototypes and test at large scale; and Phase 3--Field trial smart bit-fluid concepts, modify as necessary and commercialize products. As of report date, TerraTek has concluded all major preparations for the high pressure drilling campaign. Baker Hughes encountered difficulties in providing additional pumping capacity before TerraTek's scheduled relocation to another facility, thus the program was delayed further to accommodate the full testing program.

  15. 30 CFR 250.456 - What safe practices must the drilling fluid program follow?

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...you may safely contain under a shut-in BOP for each casing string. The pressures posted must consider the surface pressure...you may bullhead test fluids out of the drill-stem test string and tools with an appropriate kill weight fluid;...

  16. 30 CFR 250.456 - What safe practices must the drilling fluid program follow?

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...you may safely contain under a shut-in BOP for each casing string. The pressures posted must consider the surface pressure...you may bullhead test fluids out of the drill-stem test string and tools with an appropriate kill weight fluid;...

  17. 30 CFR 250.456 - What safe practices must the drilling fluid program follow?

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...you may safely contain under a shut-in BOP for each casing string. The pressures posted must consider the surface pressure...you may bullhead test fluids out of the drill-stem test string and tools with an appropriate kill weight fluid;...

  18. 30 CFR 250.456 - What safe practices must the drilling fluid program follow?

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...you may safely contain under a shut-in BOP for each casing string. The pressures posted must consider the surface pressure...you may bullhead test fluids out of the drill-stem test string and tools with an appropriate kill weight fluid;...

  19. Microscopic flow study of model drilling fluid viscoelasticity on hole cleaning

    SciTech Connect

    Vinod, P.S.; Chow, T.W.; McIntire, L.V. [Rice Univ., Houston, TX (United States). Dept. of Chemical Engineering; Elward-Berry, J. [Exxon Production Research C., Houston, TX (United States)

    1995-12-31

    One of the technical challenges in directional drilling is transporting drilled cuttings to the surface, because of the narrow settling clearance for the cuttings on the low side of the bore hole. Drilling fluid rheology is one of the factors determining the presence and size of the cuttings bed formed on the low side. Microscopic studies were carried out to compare the efficiency of purely viscous and viscoelastic rheology models to predict velocities of this cuttings transport process. Video microscopy, digital image processing and finite element analysis techniques were combined to study the effect of fluid rheology on the movement and resuspension of a model particle bed under well defined shearing flow conditions. The studies demonstrated that fluid material properties such as apparent viscosity, plastic viscosity (PV), yield point (YP) and gel-strength estimated from purely viscous fluid rheological models had limitations in predicting particle mobilization velocities and settling times.

  20. Development and evaluation of a meter for measuring return line fluid flow rates during drilling

    SciTech Connect

    Loeppke, G.E.; Schafer, D.M.; Glowka, D.A.; Scott, D.D.; Wernig, M.D. (Sandia National Labs., Albuquerque, NM (United States)); Wright, E.K. (Ktech Corp., Albuquerque, NM (United States))

    1992-06-01

    The most costly problem routinely encountered in geothermal drilling is lost circulation, which occurs when drilling fluid is lost to the formation rather than circulating back to the surface. The successful and economical treatment of lost circulation requires the accurate measurement of drilling fluid flow rate both into and out of the well. This report documents the development of a meter for measuring drilling fluid outflow rates in the return line of a drilling rig. The meter employs a rolling counterbalanced float that rides on the surface of the fluid in the return line. The angle of the float pivot arm is sensed with a pendulum potentiometer, and the height of the float is calculated from this measurement. The float height is closely related to the fluid height and, therefore, the flow rate in the line. The prototype rolling float meter was extensively tested under laboratory conditions in the Wellbore Hydraulics Flow Facility; results from these tests were used in the design of the field prototype rolling float meter. The field prototype meter was tested under actual drilling conditions in August and September 1991 at the Long Valley Exploratory Well near Mammoth Lakes, Ca. In addition, the performance of several other commercially available inflow and outflow meters was evaluated in the field. The tested inflow meters included conventional pump stroke counters, rotary pump speed counters, magnetic flowmeters, and an ultrasonic Doppler flowmeter. On the return flow line, a standard paddlemeter, an acoustic level meter, and the prototype rolling float meter were evaluated for measuring drilling fluid outflow rates.

  1. Optimization of Deep Drilling Performance--Development and Benchmark Testing of Advanced Diamond Product Drill Bits & HP/HT Fluids to Significantly Improve Rates of Penetration

    SciTech Connect

    Alan Black; Arnis Judzis

    2003-10-01

    This document details the progress to date on the OPTIMIZATION OF DEEP DRILLING PERFORMANCE--DEVELOPMENT AND BENCHMARK TESTING OF ADVANCED DIAMOND PRODUCT DRILL BITS AND HP/HT FLUIDS TO SIGNIFICANTLY IMPROVE RATES OF PENETRATION contract for the year starting October 2002 through September 2002. The industry cost shared program aims to benchmark drilling rates of penetration in selected simulated deep formations and to significantly improve ROP through a team development of aggressive diamond product drill bit--fluid system technologies. Overall the objectives are as follows: Phase 1--Benchmark ''best in class'' diamond and other product drilling bits and fluids and develop concepts for a next level of deep drilling performance; Phase 2--Develop advanced smart bit--fluid prototypes and test at large scale; and Phase 3--Field trial smart bit--fluid concepts, modify as necessary and commercialize products. Accomplishments to date include the following: 4Q 2002--Project started; Industry Team was assembled; Kick-off meeting was held at DOE Morgantown; 1Q 2003--Engineering meeting was held at Hughes Christensen, The Woodlands Texas to prepare preliminary plans for development and testing and review equipment needs; Operators started sending information regarding their needs for deep drilling challenges and priorities for large-scale testing experimental matrix; Aramco joined the Industry Team as DEA 148 objectives paralleled the DOE project; 2Q 2003--Engineering and planning for high pressure drilling at TerraTek commenced; 3Q 2003--Continuation of engineering and design work for high pressure drilling at TerraTek; Baker Hughes INTEQ drilling Fluids and Hughes Christensen commence planning for Phase 1 testing--recommendations for bits and fluids.

  2. Composition and method of preparation of novel aqueous drilling fluid additives

    SciTech Connect

    Chen, R. G.; Patel, A. D.; Sample Jr., T. E.

    1985-06-04

    The present invention relates to new compositions and methods of preparation of deflocculents for water-base mud additives. The disclosed materials are low molecular weight terpolymers and graft copolymers consisting essentially of monovalent salts of 5 to 50% by weight of tetrahydrophthalic acid (THPA); 10 to 70% by weight of acrylic acid (AA); 5 to 50% by weight of 2-acrylamido-2-methylpropane sulfonic acid (AMPS); and 0 to 70% by weight of lignosulfonate units. The unique compositions and processes of terpolymers and graft copolymers provide excellent drilling fluid additives which significantly control the viscosity, yield point, gel strength, and fluid loss of drilling fluids over a wide range of temperatures and in the presence of contaminants such as salt, lime, cement, gypsum and drilled solids.

  3. An ecosystem perspective on potential impacts of drilling fluid discharges on seagrasses

    NASA Astrophysics Data System (ADS)

    Kelly, John R.; Duke, Thomas W.; Harwell, Mark A.; Harwell, Christine C.

    1987-08-01

    Potential effects of oil drilling fluid discharges upon Thalassia seagrass ecosystems were examined using seagrass core microcosms. Observed experimental effects, summarized in this article, included changes in both autotrophic ( Thalassia and epiphyte) and heterotrophic (dominant benthic macroinvertebrates) species, and the processes of primary productivity and decomposition. The physical disturbance related to greater turbidity and sedimentation caused some effects, while others seemed a direct response to the toxic constituents of drilling fluids. Using these experimental results and the case of Thalassia and drilling fluids as a case study, we explore general methodological and philosophical issues for ecotoxicology and, furthermore, focus upon the challenge of providing a scientific basis for judging acceptability of environmental changes likely to ensue from human activities.

  4. Towards the design of new and improved drilling fluid additives using molecular dynamics simulations.

    PubMed

    Anderson, Richard L; Greenwel, H Christopher; Suter, James L; Jarvis, Rebecca M; Coveney, Peter V

    2010-03-01

    During exploration for oil and gas, a technical drilling fluid is used to lubricate the drill bit, maintain hydrostatic pressure, transmit sensor readings, remove rock cuttings and inhibit swelling of unstable clay based reactive shale formations. Increasing environmental awareness and resulting legislation has led to the search for new, improved biodegradable drilling fluid components. In the case of additives for clay swelling inhibition, an understanding of how existing effective additives interact with clays must be gained to allow the design of improved molecules. Owing to the disordered nature and nanoscopic dimension of the interlayer pores of clay minerals, computer simulations have become an increasingly useful tool for studying clay-swelling inhibitor interactions. In this work we briefly review the history of the development of technical drilling fluids, the environmental impact of drilling fluids and the use of computer simulations to study the interactions between clay minerals and swelling inhibitors. We report on results from some recent large-scale molecular dynamics simulation studies on low molecular weight water-soluble macromolecular inhibitor molecules. The structure and interactions of poly(propylene oxide)-diamine, poly(ethylene glycol) and poly(ethylene oxide)-diacrylate inhibitor molecules with montmorillonite clay are studied. PMID:20209242

  5. Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids

    SciTech Connect

    Giddings, D. M.; Ries, D. G.; Syrinek, A. R.

    1985-03-05

    Novel water-soluble terpolymers comprising: 2-acrylamido-2-methylpropanesulfonic acid, sodium salt (AMPS) N-vinylpyrrolidone, and acrylonitrile These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.

  6. Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids

    SciTech Connect

    Giddings, D. M.; Ries, D. G.; Syrinek, A. R.

    1985-03-05

    Novel water-soluble terpolymers comprising: 2-acrylamido-2-methylpropanesulfonic acid, sodium salt (AMPS), acrylamide, N, N-diallylacetamide These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.

  7. Terpolymers for use as high temperature fluid loss additive and rheology stabilizer for high pressure, high temperature oil well drilling fluids

    SciTech Connect

    Giddings, D. M.; Ries, D. G.; Syrinek, A. R.

    1985-03-05

    Novel water-soluble terpolymers comprising: 2-acrylamido-2-methylpropanesulfonic acid, sodium salt (AMPS), N, N-dimethylacrylamide, and acrylonitrile These terpolymers provide high temperature fluid loss additives and rheology stabilizers for high calcium-containing brine clay drilling fluids.

  8. ACUTE TOXICITY OF TWO GENERIC DRILLING FLUIDS AND SIX ADDITIVES, ALONE AND COMBINED, TO MYSIDS ('MYSIDOPSIS BAHIA')

    EPA Science Inventory

    Toxicity tests were conducted with two laboratory-prepared generic drilling fluids (muds) and six commonly used drilling fluid additives to determine their toxicity, alone and combined, to mysids (Mysidopsis bahia). In 25 tests, the acute toxicity of combinations of one, two, or ...

  9. DRILLING FLUIDS AND THE ARCTIC TUNDRA OF ALASKA: ASSESSING CONTAMINATION OF WETLANDS HABITAT AND THE TOXICITY TO AQUATIC INVERTEBRATES AND FISH (JOURNAL VERSION)

    EPA Science Inventory

    Drilling for oil on the North Slope of Alaska results in the release of large volumes of used drilling fluids into arctic wetlands. These releases usually come from regulated discharges or seepage from reserve pits constructed to hold used drilling fluids. A study of five drill s...

  10. Controllable magneto-rheological fluid-based dampers for drilling

    SciTech Connect

    Raymond, David W. (Edgewood, NM); Elsayed, Mostafa Ahmed (Youngsville, LA)

    2006-05-02

    A damping apparatus and method for a drillstring comprising a bit comprising providing to the drillstring a damping mechanism comprising magnetorheological fluid and generating an electromagnetic field affecting the magnetorheological fluid in response to changing ambient conditions encountered by the bit.

  11. Removal of Filter Cake Generated by Manganese Tetraoxide Water-based Drilling Fluids 

    E-print Network

    Al Mojil, Abdullah Mohammed A.

    2011-10-21

    Three effective solutions to dissolve the filter cake created by water-based drilling fluids weighted with Mn3O4 particles were developed. Hydrochloric acid at concentration lower than 5 wt% can dissolve most of Mn3O4-based filter cake. Dissolving...

  12. Acid soluble weighting agent for well drilling, workover and completion fluids

    Microsoft Academic Search

    1982-01-01

    A new weighting material for use in controlling the specific gravity of fluids employed in the drilling, completion, perforation and workover of oil and gas wells is disclosed. The material siderite (Feco3), has the unique property of being removable from the bottom of well boreholes and producing formation zones by virtue of almost complete solubility in both mineral and organic

  13. Fate and effects of drilling fluid and cutting discharges in shallow, nearshore waters

    SciTech Connect

    Not Available

    1989-01-01

    The relationships between selected environmental parameters (sedimentology, trace metals, and hydrocarbons) and macroinfaunal assemblages were studied to determine the fate and effects of drilling fluid and cutting discharges from a multiple well site in a shallow nearshore environment. Results are presented.

  14. Selective-placement burial of drilling fluids: 1. Effects on soil chemical properties

    Microsoft Academic Search

    M. L. McFarland; S. Hartmann; D. N. Ueckert; F. M. Hons

    2009-01-01

    Burial of spent drilling fluids used in petroleum and natural gas exploration was evaluated for reducing soil contamination caused by conventional, surface disposal of these wastes on arid and semiarid rangelands. Simulated reserve pits at two locations provided burial depths of 30, 90 (with and without a 30-cm capillary barrier of coarse limestone), and 150 cm below the surface, with

  15. ACUTE TOXICITY OF EIGHT LABORATORY-PREPARED GENERIC DRILLING FLUIDS TO MYSIDS (MYSIDOPSIS BAHIA)

    EPA Science Inventory

    Acute toxicity tests were conducted during August-September 1983 with eight laboratory-prepared generic drilling fluids (also called muds) and mysids (Mysidopsis bahia) at the U.S. Environmental Protection Agency's Environmental Research Laboratory, Gulf Breeze, Florida. Two of t...

  16. Final report on the design and development of a Rolling Float Meter for drilling-fluid outflow measurement

    SciTech Connect

    Staller, G.E.; Westmoreland, J.J.; Whitlow, G.L.; Wright, E.K.; Glowka, D.A.

    1998-03-01

    Lost circulation, which is the loss of well drilling fluids to the formation while drilling, is a common problem encountered while drilling geothermal wells. The rapid detection of the loss of well drilling fluids is critical to the successful and cost-effective treatment of the wellbore to stop or minimize lost circulation. Sandia National Laboratories has developed an instrument to accurately measure the outflow rate of drilling fluids while drilling. This instrument, the Rolling Float Meter, has been under development at Sandia since 1991 and is now available for utilization by interested industry users. This report documents recent Rolling Float Meter design upgrades resulting from field testing and industry input, the effects of ongoing testing and evaluation both in the laboratory and in the field, and the final design package that is available to transfer this technology to industry users.

  17. Paleofluids and recent fluids in the upper continental crust: Results from the German Continental Deep Drilling Program (KTB)

    Microsoft Academic Search

    P. Möller; S. M. Weise; E. Althaus; W. Bach; H. J. Behr; R. Borchardt; K. Bräuer; J. Drescher; J. Erzinger; E. Faber; B. T. Hansen; E. E. Horn; E. Huenges; H. Kämpf; W. Kessels; T. Kirsten; D. Landwehr; M. Lodemann; L. Machon; A. Pekdeger; H.-U. Pielow; C. Reutel; K. Simon; J. Walther; F. H. Weinlich; M. Zimmer

    1997-01-01

    The two German Continental Deep Drilling Program (KTB) boreholes provided samples for studies of fluid inclusions (paleofluids), ``free fluids'' of the crystalline basement, and their fingerprints on the chemical and isotopic composition of minerals and rocks to 9101 m depth, which allowed reconstruction of the evolution of fluids, their migration pathways, and their sources. Aqueous fluids were largely lost during

  18. Well drilling cuttings disposal

    SciTech Connect

    Nahm, J.J.W.

    1994-01-11

    Drilled cuttings are disposed of by solidification by drilling with a drilling fluid containing blast furnace slag, thereby producing drilled cuttings and other solid wastes, concentrating the wastes and then solidifying the concentrated wastes. Drilling wastes solidified by blast furnace slag are hard and unleachable and the blast furnace slag is compatible with both oil and water based drilling muds and drilled cuttings. Drilling fluids therefore do not have to be removed from the drilled cuttings prior to solidification in a mud pit.

  19. Effects of drilling fluids on marine bacteria from a Nigerian offshore oilfield

    SciTech Connect

    Okpokwasil, G.C.; Nnubia, C. [Univ. of Prot Harcourt (Nigeria)

    1995-11-01

    Two marine bacterial isolates from drill mud cuttings obtained from Agbara oilfield, Staphylococcus sp. and Bacillus sp., were cultured aerobically in the presence of varying concentrations (0, 25, 50, and 75 {mu}g/ml) of drilling fluids to determine the effects of concentration of toxicants on their growth. With the exception of Clairsol, Enviromul, and Bariod mineral oil, which had little or no effect, the exponential growth of Bacillus sp. was depressed by all other test chemicals. Additionally, all test chemicals except Clairsol had no effect on lag phase of growth of Bacillus sp. With Staphylococcus sp. the depressive effect on the exponential phase of growth was shown by almost all test chemicals. There was enhancement of both growth rate and generation times of Staphylococcus sp. and decrease of those of Bacillus sp. with increasing concentrations of drilling fluids. These results show that while some drilling fluids may be stimulatory or depressive to bacterial growth, others may be without effect. 23 refs., 6 figs., 3 tabs.

  20. Virtual rheology and hydraulics improve use of oil and synthetic-based muds

    SciTech Connect

    Zamora, M. [M-I Drilling Fluids LLC, Houston, TX (United States)

    1997-03-03

    Two evolutionary concepts, virtual hydraulics and virtual rheology, have significantly improved the understanding and application of drilling fluid rheology and the hydraulics of oil-based and synthetic-based muds. When combined to form the core of a unitized suite of software modules, they provide new technology which is a step improvement over conventional approaches to calculate equivalent circulating densities (ECDs) and pump pressures for oil and synthetic-based muds (OBMs and SBMs). More-accurate predictions are now possible for downhole mud rheology, circulating and static densities, frictional pressure losses, and pump pressures. While the concepts are not new in the strictest sense, neither has been fully exploited and implemented until now. The first concept, virtual hydraulics (VH), subdivides the well into short depth segments and combines variable downhole rheology with localized downhole conditions for hydraulics calculations. This permits a unique downhole perspective of hydraulics and rheology at a single point in time. The second concept, virtual rheology (VR), takes full advantage of available field and lab data for the specific mud in use to determine downhole rheological properties as a function of temperature and pressure.

  1. FLUID ELEMENTS AND THEIR TECHNICAL APLICATION FOR THE AUTOMATIC ADJUSTMENT OF THE ADVANCE FORCE AT THE PNEUMATIC ROTATING HAMMER DRILLS

    Microsoft Academic Search

    A. COTETIU; M. ALEXANDRESCU; M. COSMA

    This paper presents the actual solution used by Secoma Enterprise and a new solution concerning the implementation of the digital devices in the pressing strength's control of a pneumatic rotating hammer drill, which is included in the structure of the drilling installation. The monostable element, which was proposed to be used, is a special device, with an incompressible fluid as

  2. New chemistry for chromium-free bentonite drilling fluids stable at high temperatures

    SciTech Connect

    Burrafato, G.; Miano, F.; Carminati, S.; Lockhart, T.P.

    1995-11-01

    The broad substitution of aqueous drilling fluids for oil-based muds will require that the performance limitations of current aqueous muds be overcome. The research described in this paper is focused on the most commonly-used aqueous drilling fluids, lignosulfonate (LSO{sub 3})-dispersed bentonite muds, and addresses two important issues that restrict their wider use: their limited stability at elevated temperature, and their reliance on chromium-containing additives (Cr-LSO{sub 3} and Cr-lignite) for control of their rheological properties. In this paper, new hypotheses regarding the mode of action of Cr(VI) and Cr(III) in Cr-LSO{sub 3}/bentonite muds are formulated on the basis of new and published experimental observations. Of primary importance are the ideas that (1) LSO{sub 3}-bound Cr(III) is the form which enhances the thinning power of LSO{sub 3} and (2) Cr(VI) stabilizes LSO{sub 3}/bentonite muds primarily by acting as a latent source of Cr(III). Acting on these hypotheses, it has been found that Cr(III) complexes of appropriate kinetic stability can duplicate the rheology-stabilizing function of Cr(VI). Further pursuit of this coordination chemical approach has led to the identification of a family of Zr(IV) complexes with which chromium-free drilling fluids of outstanding rheological stability can be prepared. The general chemical factors influencing the rheology-stabilizing activity of metal ion complexes are examined. Finally, the unexpected and remarkable thinning power of the Zr(IV) citrate complex is described and its implications for the formulation of novel drilling fluids are briefly discussed.

  3. Rheological properties of oil-based drilling fluids at high temperature and high pressure

    Microsoft Academic Search

    Sheng-ying Zhao; Jie-nian Yan; Yong Shu; Hong-xia Zhang

    2008-01-01

    The rheological properties of two kinds of oil-based drilling fluids with typically composition were studied at pressures\\u000a up to 138 MPa and temperatures up to 204 °C using the RheoChan 7400 Rheometer. The experimental results show that the apparent\\u000a viscosity, plastic viscosity and yield point decrease with the increase of temperature, and increase with the increase of\\u000a pressure. The effect

  4. Gas Solubility in Oil-Based Drilling Fluids: Effects on Kick Detection

    Microsoft Academic Search

    David Thomas; E. A. Turek

    1984-01-01

    This paper describes the effects of gas solubility on the properties of oil-based drilling fluids. Prediction methods for gas solubility in oil-based muds were tested by experimental work and found acceptable. Expansion of discrete mixtures of mud and gas are predicted. A blowout simulation program was written and used to predict the effects of a kick on the surface-observable indicators

  5. Swelling of Oil-Based Drilling Fluids Resulting From Dissolved Gas

    Microsoft Academic Search

    Patrick OBryan; Adam Bourgoyne Jr.

    1990-01-01

    The method presented in this paper uses an experimentally calibrated equation-of-state (EOS) model to estimate the swelling of oil-based drilling fluids caused by dissolved methane. With this method, the pit gain associated with a given kick size can be determined. The calculation method was verified by experiments conducted in a 6,000-ft (1828.8-m) test well. Example calculations are also presented.

  6. WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS

    Microsoft Academic Search

    Jill S. Buckley; Norman R. Morrow

    2005-01-01

    Exposure to crude oil in the presence of an initial brine saturation can render rocks mixed-wet. Subsequent exposure to components of synthetic oil-based drilling fluids can alter the wetting toward less water-wet or more oil-wet conditions. Mixing of the non-aromatic base oils used in synthetic oil-based muds (SBM) with an asphaltic crude oil can destabilize asphaltenes and make cores less

  7. Experimental Studies of Ilmenite as a Weighting Material in Oil-based Drilling Fluids for HPHT Operations 

    E-print Network

    Xiao, Jie

    2013-12-06

    cost, performance, and availability. A typical fundamental composition of oil-based drilling mud is: ? Mineral oil and water. ? Emulsifier. ? Lime. ? Viscosifier. ? CaCl2. ? Filtration control agent. ? Weighting material. 2.2.1 Mineral Oil.... Micronized ilmenite was supplied by Elkem A/S Company. Table 4 summarizes the components that were used to prepare the oil-based drilling fluids. The chemicals used in this work such as viscosifiers, emulsifiers and fluid loss agents were kindly supplied...

  8. Experimental Studies of Ilmenite as a Weighting Material in Oil-based Drilling Fluids for HPHT Operations

    E-print Network

    Xiao, Jie

    2013-12-06

    cost, performance, and availability. A typical fundamental composition of oil-based drilling mud is: ? Mineral oil and water. ? Emulsifier. ? Lime. ? Viscosifier. ? CaCl2. ? Filtration control agent. ? Weighting material. 2.2.1 Mineral Oil.... Micronized ilmenite was supplied by Elkem A/S Company. Table 4 summarizes the components that were used to prepare the oil-based drilling fluids. The chemicals used in this work such as viscosifiers, emulsifiers and fluid loss agents were kindly supplied...

  9. Experimental study of the effect of polyanionic cellulose on process of filtrate loss of low-solids drilling fluid

    NASA Astrophysics Data System (ADS)

    yang, P.

    2013-12-01

    Experimental study of the effect of polyanionic cellulose on process of filtrate loss of low-solids drilling fluid Ping Yang 1,2, Min-hui Wu2, Xue-wen Zhu2, Tao Deng2, Xue-qing Sun2 1. Key Laboratory of Geotechnical and Underground Engineering of Ministry of Education, Tongji University, Shanghai 200092,China 2. Department of Geotechnical Engineering,Tongji University,Shanghai 200092,China Abstract The process of filtrate loss of low-solids drilling fluid was tested by changing the polyanionic cellulose content in low-solids drilling fluid. The effect of polyanionic cellulose on process of filtrate loss of low-solids drilling fluid was analyzed. The test results showed that when time of filtration is same, the volume of filtrate loss decreases linearly with increasing polyanionic cellulose content. When polyanionic cellulose content is same, the rate of filtrate loss decreases nonlinearly with increasing time and the rate of filtrate loss will reach a stable value.The volume of filtrate loss in 7 to 8 minutes can reaches half of the total volume of filtrate loss. At the same time, the rate of filtrate loss of drilling fluid decreases nonlinearly with increasing viscosity.When the apparent viscosity is between 3.5~4.15 MPa.s, decrease speed of rate of filtrate loss of drilling fluid is quick. The results are helpful for characteristics evaluation of filtrate loss of drilling fluid and control of filtrate loss. Keyword Polyanionic Cellulose,Drilling Fluid,Process of Filtrate Loss Acknowledgments This investigation was supported by the National Natural Science Foundation of China (projects No. 41002093 and 41072205); the Fundamental Research Funds for the Central Universities; the Shanghai Leading Academic Discipline Project (project No. B308), Tongji University; and the Program for Young Excellent Talents, Tongji University. The authors are extremely grateful for the financial support from these five organizations.

  10. Potential environmental benefits from regulatory consideration of synthetic drilling muds

    SciTech Connect

    Burke, C.J.; Veil, J.A. [Argonne National Lab., IL (United States). Environmental Assessment Div.

    1995-02-01

    When drilling exploration and production wells for oil and gas, drillers use specialized drilling fluids, referred to as muds, to help maintain well control and to remove drill cuttings from the hole. Historically, either water-based muds (WBMs) or oil-based muds (OBMs) have been used for offshore wells. Recently, in response to US Environmental Protection Agency (EPA) regulations and drilling-waste discharge requirements imposed by North Sea nations, the drilling industry has developed several types of synthetic-based muds (SBMs) that combine the desirable operating qualities of OBMs with the lower toxicity and environmental impact qualities of WBMs. This report describes the operational, environmental, and economic features of all three types of muds and discusses potential EPA regulatory barriers to wider use of SBMs.

  11. Comparative evaluation of the indigenous microbial diversity vs. drilling fluid contaminants in the NEEM Greenland ice core.

    PubMed

    Miteva, Vanya; Burlingame, Caroline; Sowers, Todd; Brenchley, Jean

    2014-08-01

    Demonstrating that the detected microbial diversity in nonaseptically drilled deep ice cores is truly indigenous is challenging because of potential contamination with exogenous microbial cells. The NEEM Greenland ice core project provided a first-time opportunity to determine the origin and extent of contamination throughout drilling. We performed multiple parallel cultivation and culture-independent analyses of five decontaminated ice core samples from different depths (100-2051 m), the drilling fluid and its components Estisol and Coasol, and the drilling chips collected during drilling. We created a collection of diverse bacterial and fungal isolates (84 from the drilling fluid and its components, 45 from decontaminated ice, and 66 from drilling chips). Their categorization as contaminants or intrinsic glacial ice microorganisms was based on several criteria, including phylogenetic analyses, genomic fingerprinting, phenotypic characteristics, and presence in drilling fluid, chips, and/or ice. Firmicutes and fungi comprised the dominant group of contaminants among isolates and cloned rRNA genes. Conversely, most Proteobacteria and Actinobacteria originating from the ice were identified as intrinsic. This study provides a database of potential contaminants useful for future studies of NEEM cores and can contribute toward developing standardized protocols for contamination detection and ensuring the authenticity of the microbial diversity in deep glacial ice. PMID:24450335

  12. Mathematical models of cuttings transport and drilling fluid displacement by cement slurry in horizontal wells

    NASA Astrophysics Data System (ADS)

    Nguyen, Desmond

    Arguably the most important prerequisite to a good primary cementing job is mud displacement. In order to have effective mud displacement, complete removal of drilled cuttings from the well bore is required. This becomes more challenging in highly-deviated to horizontal wells where the casing tends to lie on the low side of the well bore creating an eccentric annular flow geometry. In this study, a theoretical approach based on the theory of particles transport and fluid mechanics is adopted to develop two new mathematical models: (1) cuttings transport; and (2) drilling fluid displacement by cement slurry in horizontal wells. Two computer algorithms are developed based on these models. The effects of various operational conditions, hole geometry and fluid properties are simulated using these computer models. The results compare favourably with those obtained by previous investigators. These simulated examples demonstrate that the two models can be used to analyse the sensitivity of the cuttings transport and displacement processes to changes in the operational conditions, hole geometry and fluid properties. Hence, they can potentially be used as design and/or analysis tools for the optimisation of these processes in highly- deviated to horizontal wells.

  13. Numerical simulation of heat transfer and fluid flow in laser drilling of metals

    NASA Astrophysics Data System (ADS)

    Zhang, Tingzhong; Ni, Chenyin; Zhou, Jie; Zhang, Hongchao; Shen, Zhonghua; Ni, Xiaowu; Lu, Jian

    2015-05-01

    Laser processing as laser drilling, laser welding and laser cutting, etc. is rather important in modern manufacture, and the interaction of laser and matter is a complex phenomenon which should be detailed studied in order to increase the manufacture efficiency and quality. In this paper, a two-dimensional transient numerical model was developed to study the temperature field and molten pool size during pulsed laser keyhole drilling. The volume-of-fluid method was employed to track free surfaces, and melting and evaporation enthalpy, recoil pressure, surface tension, and energy loss due to evaporating materials were considered in this model. Besides, the enthalpy-porosity technique was also applied to account for the latent heat during melting and solidification. Temperature fields and melt pool size were numerically simulated via finite element method. Moreover, the effectiveness of the developed computational procedure had been confirmed by experiments.

  14. SUMMARY OF DRILLING FLUID RESEARCH ACTIVITIES, U.S. ENVIRONMENTAL PROTECTION AGENCY, ENVIRONMENTAL RESEARCH LABORATORY, GULF BREEZE

    EPA Science Inventory

    Drilling-fluid related research at the U.S. EPA Environmental Research Laboratory, Gulf Breeze, is summarized. The program is conducted primarily through contracts, grants, and some inhouse projects designed to assess the potential hazard to the marine environment from fluids dis...

  15. Transesterification reaction for synthesis of palm-based ethylhexyl ester and formulation as base oil for synthetic drilling fluid.

    PubMed

    Abdul Habib, Nor Saiful Hafiz; Yunus, Robiah; Rashid, Umer; Taufiq-Yap, Yun H; Abidin, Zurina Zainal; Syam, Azhari Muhammad; Irawan, Sonny

    2014-01-01

    The use of vegetable oil-based ester as a base fluid in synthetic drilling fluid has become a trend in drilling operations due to its environmental advantages. The transesterification reaction of palm oil methyl ester (POME) with 2-ethylhexanol (2EH) produced 98% of palm oil-based ethylhexyl ester in less than 30 minutes. Since the transesterification reaction of POME with 2EH is a reversible reaction, its kinetics was studied in the presence of excess EH and under vacuum. The POME-to-EH molar ratio and vacuum pressure were held constant at 1:2 and 1.5 mbar respectively and the effects of temperature (70 to 110°C) were investigated. Using excess of EH and continual withdrawal of methanol via vacuum promoted the reaction to complete in less than 10 minutes. The rate constant of the reaction (k) obtained from the kinetics study was in the range of 0.44 to 0.66 s?¹ and the activation energy was 15.6 kJ.mol?¹. The preliminary investigations on the lubrication properties of drilling mud formulated with palm oil-based 2EH ester indicated that the base oil has a great potential to substitute the synthetic ester-based oil for drilling fluid. Its high kinematic viscosity provides better lubrication to the drilling fluid compared to other ester-based oils. The pour point (-15°C) and flash point (204°C) values are superior for the drilling fluid formulation. The plastic viscosity, HPHT filtrate loss and emulsion stability of the drilling fluid had given acceptable values, while gel strength and yield point could be improved by blending it with proper additives. PMID:24717547

  16. Evaluation of polymer free drill-in fluids for use in high productivity, horizontal well completions

    E-print Network

    Falla Ramirez, Jorge H

    2001-01-01

    , CEA 73 has shown the nature and role of drill solids in both wellbore damage and damage in sand- control screens. ' This thesis follows the style of the Society of Petroleum Engineers Journal. The main goals of this work are: 1. To quantify... of the CEA-73 project, including Texas A&M University, the US Department of Energy, and the Global Petroleum Research Institute. Special thanks are due to the staff of TBC Brinadd who have provided fluid samples and support for laboratory tests. TABLE...

  17. Synthesis and performance evaluation of a new deoiling agent for treatment of waste oil-based drilling fluids.

    PubMed

    Liu, Pingting; Huang, Zhiyu; Deng, Hao; Wang, Rongsha; Xie, Shuixiang

    2014-01-01

    Oil-based drilling fluid is used more and more in the field of oil and gas exploration. However, because of unrecyclable treating agent and hard treatment conditions, the traditional treating technologies of waste oil-based drilling fluid have some defects, such as waste of resource, bulky equipment, complex treatment processes, and low oil recovery rate. In this work, switchable deoiling agent (SDA), as a novel surfactant for treatment of waste oil-based drilling fluid, was synthesized by amine, formic acid, and formaldehyde solution. With this agent, the waste oil-based drilling fluid can be treated without complex process and expensive equipment. Furthermore, the agent used in the treatment can be recycled, which reduces waste of resource and energy. The switch performance, deoiling performance, structural characterization, and mechanisms of action are studied. The experimental results show that the oil content of the recycled oil is higher than 96% and more than 93% oil in waste oil-based drilling fluid can be recycled. The oil content of the solid residues of deoiling is less than 3%. PMID:25045749

  18. Synthesis and Performance Evaluation of a New Deoiling Agent for Treatment of Waste Oil-Based Drilling Fluids

    PubMed Central

    Liu, Pingting; Huang, Zhiyu; Deng, Hao; Wang, Rongsha; Xie, Shuixiang

    2014-01-01

    Oil-based drilling fluid is used more and more in the field of oil and gas exploration. However, because of unrecyclable treating agent and hard treatment conditions, the traditional treating technologies of waste oil-based drilling fluid have some defects, such as waste of resource, bulky equipment, complex treatment processes, and low oil recovery rate. In this work, switchable deoiling agent (SDA), as a novel surfactant for treatment of waste oil-based drilling fluid, was synthesized by amine, formic acid, and formaldehyde solution. With this agent, the waste oil-based drilling fluid can be treated without complex process and expensive equipment. Furthermore, the agent used in the treatment can be recycled, which reduces waste of resource and energy. The switch performance, deoiling performance, structural characterization, and mechanisms of action are studied. The experimental results show that the oil content of the recycled oil is higher than 96% and more than 93% oil in waste oil-based drilling fluid can be recycled. The oil content of the solid residues of deoiling is less than 3%. PMID:25045749

  19. Graphene oxide as a high-performance fluid-loss-control additive in water-based drilling fluids.

    PubMed

    Kosynkin, Dmitry V; Ceriotti, Gabriel; Wilson, Kurt C; Lomeda, Jay R; Scorsone, Jason T; Patel, Arvind D; Friedheim, James E; Tour, James M

    2012-01-01

    Graphene oxide (GO) performs well as a filtration additive in water-based drilling fluids at concentrations as low as 0.2 % (w/w) by carbon content. Standard American Petroleum Institute (API) filtration tests were conducted on pH-adjusted, aqueous dispersions of GO and xanthan gum. It was found that a combination of large-flake GO and powdered GO in a 3:1 ratio performed best in the API tests, allowing an average fluid loss of 6.1 mL over 30 min and leaving a filter cake ~20 ?m thick. In comparison, a standard suspension (~12 g/L) of clays and polymers used in the oil industry gave an average fluid loss of 7.2 mL and a filter cake ~280 ?m thick. Scanning electron microscopy imaging revealed the extreme pliability of well-exfoliated GO, as the pressure due to filtration crumpled single GO sheets, forcing them to slide through pores with diameters much smaller than the flake's flattened size. GO solutions also exhibited greater shear thinning and higher temperature stability compared to clay-based fluid-loss additives, demonstrating potential for high-temperature well applications. PMID:22136134

  20. Subsurface fluid pressures from drill-stem tests, Uinta Basin, Utah

    USGS Publications Warehouse

    Nelson, P.H.

    2002-01-01

    High fluid pressures are known to be associated with oil and gas fields in the Uinta Basin, Utah. Shut-in pressure measurements from drill-stem tests show how pressure varies with depth and by area within the basin. The data base used in this report incorporates over 2,000 pressure measurements from drill-stem tests in wells completed prior to 1985. However, the number of useful pressure measurements is considerably less, because many drill-stem tests fail to stabilize at the actual formation pressure if the permeability is low. By extracting the maximum pressure measurements recorded in a collection of wells within an area, the trend of formation pressure within that area can be approximated. Areal compilations of pressures from drill-stem tests show that overpressured rock formations occur throughout much of the northern and eastern areas of the Uinta Basin. In particular, significant overpressuring (0.5 < pressure gradient < 0.8 psi/ft) is found throughout much of the Altamont-Bluebell field at depths ranging from 10,000 to 13,000 ft, equivalent to 5,000 to 8,000 ft below sea level. Limited data indicate that the pressure gradient declines at depths greater than 13,000 ft. An underpressured zone appears to exist in the Altamont-Bluebell field at depths shallower than 5,000 ft. Throughout the eastern Uinta Basin, moderately overpressured zones (0.46 < pressure gradient < 0.5 psi/ft) are common, with local evidence of significantly overpressured zones, but pressure gradients greater than 0.6 psi/ft are rare.

  1. Laboratory tests, statistical analysis and correlations for regained permeability and breakthrough time in unconsolidated sands for improved drill-in fluid cleanup practices

    E-print Network

    Serrano, Gerardo Enrique

    2000-01-01

    and measured. Beginning with a large database of 101 tests with 8 independent variables such as type of drill-in fluid, temperature, screen type, presence of gravel pack, formation type, type of drill solids, concentration of drill solids, and cleanup...

  2. Use of tracers to investigate drilling-fluid invasion and oil flushing during coring

    SciTech Connect

    Brown, A.; Marriott, F.T. (Texaco, Inc., Houston, TX (US))

    1988-11-01

    This work develops a method in which chemical tracers in the drilling fluid help determine mud filtrate invasion and the degree of oil flushing during coring of steamed and unsteamed heavy-oil formations. Salts of iodide and bromide were added to the drilling fluid while Well TO3 was cored through the Lombardi and Aurignac zones at San Ardo field in California. Vertical core plugs, taken from the periphery to the center of the retrieved whole core, were analyzed for tracer concentration. Tracer analyses indicated minimal filtrate invasion in the not-yet-steamflooded Lombardi zone and complete filtrate invasion in the steamflooded Aurignac zone. Tracer and oil saturation analyses showed the Lombardi zone to be uniform from top to bottom with an average oil saturation of 42.5% and an average porosity of 31.1%. Interpretation of tracer and oil saturation data permitted the construction of a layered model for the Aurignac zone. The layers ranged from an average oil saturation of 8% in the steamflooded layer to 37% in the bottom layer. The data showed that significant oil flushing (6%) occurred only in cores taken from the hot-waterflooded layer just below the steam zone. Vertical core-plug porosities and saturations, as determined by a unique calculating scheme, were compared with conventional and Elkins-corrected values. The comparison indicated that misapplication of the Elkins method in high-temperature formations may result in significant errors.

  3. The replacement of alkyl-phenol ethoxylates to improve the environment acceptability of drilling fluid additives

    SciTech Connect

    Getliff, J.M.; James, S.G.

    1996-12-31

    Alkyl-phenol ethoxylates (APEO) are a class of surfactants which have been used widely in the drilling fluid industry. The popularity of these surfactants is based on their cost effectiveness, availability and the range of hydrophilic-lipophilic balance values obtainable. Studies have shown that APEOs exhibit oestrogenic effects, and can cause sterility in some male aquatic species. This may have subsequent human consequences and such problems have lead to a banning of their use in some countries and agreements to phase out their use e.g. PARCOM recommendation 92/8. The use of APEOs as additives in detergents, lubricants and stuck-pipe release agents for drilling fluid applications is discussed. The effectiveness of products formulated with APEOs are directly compared with alternative products which are non-persistent and less damaging to aquatic species. Lubricity measurements using standard and in-house designed equipment and washing tests to compare the efficiency of surfactants are explained and product performance results presented. The results show that alternatives to products containing APEOs are available and that in some cases they show a better technical performance. In addition to the improved environmental acceptability of the base chemicals, the better performance enables lower concentrations to be used, hence reducing the environmental impact even further.

  4. Drilling reveals fluid control on architecture and rupture of the Alpine Fault, New Zealand

    NASA Astrophysics Data System (ADS)

    Sutherland, R.; Toy, V. G.; Townend, J.; Cox, S.; Eccles, J. D.; Faulkner, D. R.; Prior, D. J.; Norris, R. J.; Mariani, E.; Boulton, C. J.; Carpenter, B. M.; Menzies, C. D.; Little, T. A.; Hasting, M. A.; De Pascale, G. P.; Langridge, R. M.; Scott, H. R.; Reid Lindroos, Z.; Fleming, B.; Kopf, A.

    2012-12-01

    Results from the first two boreholes (DFDP-1) drilled through the Alpine Fault, which is late in its 200-400 year earthquake cycle, reveal a >50 m-thick 'alteration zone' formed by fluid-rock interaction and mineralization above background regional levels. The alteration zone, which comprises cemented low-permeability cataclasite and ultramylonite dissected by clay-filled fractures, obscures the boundary between the damage zone and fault core. The fault core contains a <0.5 m-thick principal slip zone (PSZ) of low electrical resistivity and high spontaneous potential within a 2 m-thick layer of gouge and ultracataclasite. A 0.53 MPa step in fluid pressure measured across this zone confirms a hydraulic seal, and is consistent with laboratory permeability measurements of order 1e-20 m2. Slug tests in the upper part of the borehole yield a permeability within the distal damage zone of c. 1e-14 m2, implying a six order-of-magnitude reduction in permeability within the alteration zone. Low permeability within 20 m of the PSZ is confirmed by a sub-hydrostatic pressure gradient, pressure relaxation times, and laboratory measurements: this suggests that dynamic pressurization likely promotes earthquake slip and motivates the hypothesis that fault zones may be regional barriers to fluid flow and sites of high fluid pressure gradient. We suggest that hydrogeological processes within the alteration zone modify permeability, strength, and seismic properties of major faults throughout their earthquake cycles.

  5. RESULTS OF THE DRILLING FLUIDS RESEARCH PROGRAM SPONSORED BY THE GULF BREEZE ENVIRONMENTAL RESEARCH LABORATORY, 1976-1984, AND THEIR APPLICATION TO HAZARD ASSESSMENT

    EPA Science Inventory

    The Environmental Research Laboratory, Gulf Breeze, FL, carried out a research program to evaluate the potential impact of drilling fluids on the marine environment from 1976-1983. Results showed that drilling fluids can be toxic to marine animals at certain concentrations and ex...

  6. Investigation on the effects of ultra-high pressure and temperature on the rheological properties of oil-based drilling fluids

    E-print Network

    Ibeh, Chijioke Stanley

    2009-05-15

    Designing a fit-for-purpose drilling fluid for high-pressure, high-temperature (HP/HT) operations is one of the greatest technological challenges facing the oil and gas industry today. Typically, a drilling fluid is subjected to increasing...

  7. Effects of Exposure of Crocodiles to Sublethal Concentrations of Petroleum Waste Drilling Fluid in the Niger Delta Basin of Midwestern Nigeria

    Microsoft Academic Search

    F. A. Ekpubeni; E. O. Ekundayo

    2002-01-01

    Static bioassay were carried out using two aquatic crocodiles (the short nosed crocodile, Osteolemus tetraspis and the Nile crocodile, Crocodilus niloticus) as test organisms in soft natural dilution water, with Petroleum waste drilling fluid as the test material, at 28 ± 2 °C. Comparison of results for the control and different concentrations of the waste drilling fluid were made by

  8. Effects of oil and gas well-drilling fluids on the biomass and community structure of microbiota that colonize sands in running seawater

    Microsoft Academic Search

    Glen A. Smith; Janet S. Nickels; Ronald J. Bobbie; Norman L. Richards; David C. White

    1982-01-01

    Well-drilling fluid and a number of the known components (barite, clay, Aldacide®, Surflo®, and Dowicide®, were tested for effects on the biomass and community structure of the microbiota that colonize marine sands exposed for eight weeks to running ambient seawater. Shading the microbiota from light depressed the microflora without a significant effect on the biomass, while well-drilling fluids layered on

  9. Microbial Diversity in Ultra-High-Pressure Rocks and Fluids from the Chinese Continental Scientific Drilling Project in China

    PubMed Central

    Zhang, Gengxin; Dong, Hailiang; Xu, Zhiqin; Zhao, Donggao; Zhang, Chuanlun

    2005-01-01

    Microbial communities in ultra-high-pressure (UHP) rocks and drilling fluids from the Chinese Continental Scientific Drilling Project were characterized. The rocks had a porosity of 1 to 3.5% and a permeability of ?0.5 mDarcy. Abundant fluid and gas inclusions were present in the minerals. The rocks contained significant amounts of Fe2O3, FeO, P2O5, and nitrate (3 to 16 ppm). Acridine orange direct counting and phospholipid fatty acid analysis indicated that the total counts in the rocks and the fluids were 5.2 × 103 to 2.4 × 104 cells/g and 3.5 × 108 to 4.2 × 109 cells/g, respectively. Enrichment assays resulted in successful growth of thermophilic and alkaliphilic bacteria from the fluids, and some of these bacteria reduced Fe(III) to magnetite. 16S rRNA gene analyses indicated that the rocks were dominated by sequences similar to sequences of Proteobacteria and that most organisms were related to nitrate reducers from a saline, alkaline, cold habitat; however, some phylotypes were either members of a novel lineage or closely related to uncultured clones. The bacterial communities in the fluids were more diverse and included Proteobacteria, Bacteroidetes, gram-positive bacteria, Planctomycetes, and Candidatus taxa. The archaeal diversity was lower, and most sequences were not related to any known cultivated species. Some archaeal sequences were 90 to 95% similar to sequences recovered from ocean sediments or other subsurface environments. Some archaeal sequences from the drilling fluids were >93% similar to sequences of Sulfolobus solfataricus, and the thermophilic nature was consistent with the in situ temperature. We inferred that the microbes in the UHP rocks reside in fluid and gas inclusions, whereas those in the drilling fluids may be derived from subsurface fluids. PMID:15933024

  10. Deep Drilling to Decipher Potential Interaction Between Shallow and Deep Fluid Systems: Preliminary Results From the INFLUINS Drilling Campaign in the Thuringian Basin, Central Germany

    NASA Astrophysics Data System (ADS)

    Kukowski, N.; Totsche, K. U.; Methe, P.; Goepel, A.; Abratis, M.; Habisreuther, A.; Kunkel, C.; Ward, T.

    2014-12-01

    To shed light on the coupled dynamics of near surface and deep fluid systems in a sedimentary basin on various scales, ranging from the pore scale to the extent of an entire basin, is the overall goal of INFLUINS (INtegrated FLuid dynamics IN Sedimentary basins). To do so is essential to understand the functioning of sedimentary basins fluid systems. An integral INFLUINS topic also is the potential interaction of aquifers within a basin and at its rims. Regionally, INFLUINS is focusing on the Thuringian basin, a well-confined, intra-continental sedimentary basin in central Germany as a natural geo-laboratory. The Thuringian basin is composed of sedimentary rocks from the latest Paleozoic and mainly Triassic and particularly suited to undertake such research as it is of relative small size, about 50 times 100 km, easily accessible, and quite well known from previous studies. INFLUINS consists on several projects tightly connected to each other and coming from various disciplines of geosciences including among others geophysics, hydrogeology, sedimentology, mineralogy, and remote sensing. A deep drilling campaign, which took place close to Erfurt in the center of the basin in summer 2013, is one of the main achievements of INFLUINS. In preparation for deep drilling, in 2011, we conducted an extensive seismic reflection site survey, in the framework of which the center of the basin down to the top basement was imaged in high quality. Drilling went down to a depth of 1179 m, drilling Triassic rocks from Keuper to lower Buntsandstein and led to more than 500 m of cores of excellent quality and more than 600 cuttings samples. Down-hole geophysical logging over the entire depth of the drill hole is complemented with Multi Sensor Core Logging leading to an extensive geophysical data set with a spatial resolution up to the cm-scale. Here, we present overall results of the drilling campaign and focus on the boundaries between major groups as well as between prominent beds including e.g. rock salt and other pronounced aquitards.

  11. Health hazard evaluation report HETA 92-0361-2343, M-I Drilling Fluids, Greybull, Wyoming

    SciTech Connect

    Van Gilder, T.J.; Robinson, L.

    1993-08-01

    In response to a request from the state epidemiologist in Wyoming, an investigation was begun of two cases of acute, febrile hepatitis in employees of M-I Drilling Fluids (SIC-1459), Greybull, Wyoming. The two cases of hepatitis were caused by Coxiella-burnetii, the rickettsia which causes Q-fever. A survey of 39 workers using a self-administered questionnaire and a blood test revealed seven workers with serologic evidence of infection. Three showed evidence of recent infection and four showed evidence of past infection. The major risk factor identified through the questionnaire data was sheep ownership. Risk factors suggestive of either recent or past infection included working outdoors, operating heavy equipment, and hunting.

  12. BIOCHEMICAL MEASURES OF CORAL METABOLIC ACTIVITY, NUTRITIONAL STATUS AND MICROBIAL INFECTION WITH EXPOSURE TO OIL AND GAS WELL DRILLING FLUIDS

    EPA Science Inventory

    The reef building coral Montastrea annularus was exposed continuously to suspensions of oil and gas-well drilling fluids at concentrations of 0.1 ml/liter, 0.01 ml/liter, and 0.001 ml/liter in flowing seawater at the U.S. Naval Stage I platform. After 6 weeks exposure, coral frag...

  13. Validation and comparison of two sampling methods to assess dermal exposure to drilling fluids and crude oil.

    PubMed

    Galea, Karen S; McGonagle, Carolyn; Sleeuwenhoek, Anne; Todd, David; Jiménez, Araceli Sánchez

    2014-06-01

    Dermal exposure to drilling fluids and crude oil is an exposure route of concern. However, there have been no published studies describing sampling methods or reporting dermal exposure measurements. We describe a study that aimed to evaluate a wipe sampling method to assess dermal exposure to an oil-based drilling fluid and crude oil, as well as to investigate the feasibility of using an interception cotton glove sampler for exposure on the hands/wrists. A direct comparison of the wipe and interception methods was also completed using pigs' trotters as a surrogate for human skin and a direct surface contact exposure scenario. Overall, acceptable recovery and sampling efficiencies were reported for both methods, and both methods had satisfactory storage stability at 1 and 7 days, although there appeared to be some loss over 14 days. The methods' comparison study revealed significantly higher removal of both fluids from the metal surface with the glove samples compared with the wipe samples (on average 2.5 times higher). Both evaluated sampling methods were found to be suitable for assessing dermal exposure to oil-based drilling fluids and crude oil; however, the comparison study clearly illustrates that glove samplers may overestimate the amount of fluid transferred to the skin. Further comparison of the two dermal sampling methods using additional exposure situations such as immersion or deposition, as well as a field evaluation, is warranted to confirm their appropriateness and suitability in the working environment. PMID:24598941

  14. Validation and Comparison of Two Sampling Methods to Assess Dermal Exposure to Drilling Fluids and Crude Oil

    PubMed Central

    Galea, Karen S.; McGonagle, Carolyn; Sleeuwenhoek, Anne; Todd, David; Jiménez, Araceli Sánchez

    2014-01-01

    Dermal exposure to drilling fluids and crude oil is an exposure route of concern. However, there have been no published studies describing sampling methods or reporting dermal exposure measurements. We describe a study that aimed to evaluate a wipe sampling method to assess dermal exposure to an oil-based drilling fluid and crude oil, as well as to investigate the feasibility of using an interception cotton glove sampler for exposure on the hands/wrists. A direct comparison of the wipe and interception methods was also completed using pigs’ trotters as a surrogate for human skin and a direct surface contact exposure scenario. Overall, acceptable recovery and sampling efficiencies were reported for both methods, and both methods had satisfactory storage stability at 1 and 7 days, although there appeared to be some loss over 14 days. The methods’ comparison study revealed significantly higher removal of both fluids from the metal surface with the glove samples compared with the wipe samples (on average 2.5 times higher). Both evaluated sampling methods were found to be suitable for assessing dermal exposure to oil-based drilling fluids and crude oil; however, the comparison study clearly illustrates that glove samplers may overestimate the amount of fluid transferred to the skin. Further comparison of the two dermal sampling methods using additional exposure situations such as immersion or deposition, as well as a field evaluation, is warranted to confirm their appropriateness and suitability in the working environment. PMID:24598941

  15. Soil and plant response to used potassium silicate drilling fluid application.

    PubMed

    Yao, Linjun; Anne Naeth, M

    2015-10-01

    Use of drilling waste generated from the oil and gas industry for land reclamation has potential to be a practical and economical means to improve soil fertility and to decrease landfills. A four month greenhouse experiment with common barley (Hordeum vulgare L.) on three different textured soils was conducted to determine soil and plant response to incorporated or sprayed potassium silicate drilling fluid (PSDF). Two PSDF types (used once, used twice) were applied at six rates (10, 20, 30, 40, 60, 120m(3)ha(-1)) as twelve PSDF amendments plus a control (non PSDF). Effects of PSDF amendment on plant properties were significant, and varied through physiological growth stages. Barley emergence and below ground biomass were greater with used once than used twice PSDF at the same application rate in clay loam soil. Used twice PSDF at highest rates significantly increased barley above ground biomass relative to the control in loam and sand soil. All PSDF treatments significantly increased available potassium relative to the control in all three soils. Soil electrical conductivity and sodium adsorption ratio increased with PSDF addition, but not to levels detrimental to barley. Soil quality rated fair to poor with PSDF amendments in clay loam, and reduced plant performance at the highest rate, suggesting a threshold beyond which conditions are compromised with PSDF utilization. PSDF application method did not significantly affect plant and soil responses. This initial greenhouse research demonstrates that PSDF has potential as a soil amendment for reclamation, with consideration of soil properties and plant species tolerances to determine PSDF types and rates to be used. PMID:26099463

  16. Drilling Systems for Extraterrestrial Subsurface Exploration

    Microsoft Academic Search

    K. Zacny; Y. Bar-Cohen; M. Brennan; G. Briggs; G. Cooper; K. Davis; B. Dolgin; D. Glaser; B. Glass; S. Gorevan; J. Guerrero; C. McKay; G. Paulsen; C. Stoker

    2008-01-01

    Drilling consists of 2 processes: breaking the formation with a bit and removing the drilled cuttings. In rotary drilling, rotational speed and weight on bit are used to control drilling, and the optimization of these parameters can markedly improve drilling performance. Although fluids are used for cuttings removal in terrestrial drilling, most planetary drilling systems conduct dry drilling with an

  17. Correlation of fluid induced Microseismicity with Reflectivity at the German Continental Deep Drilling Site (KTB)

    NASA Astrophysics Data System (ADS)

    Rothert, E.; Shapiro, S. A.; Bohnhoff, M.

    2003-04-01

    An approach for the interpretation of microseismic data occuring during borehole fluid injections was earlier proposed to provide in-situ estimates of the hydraulic diffusivity characterizing a geothermal or hydrocarbon reservoir on the large spatial scale (on the order of 10^3m). This approach is called "Seismicity Based Reservoir Characterization" (SBRC). The SBRC is based on the hypothesis that the spatial propagation of hydraulically induced seismicity clouds is caused mainly by the pore pressure relaxation process. Furthermore, the approach assumes the following main hypothesis: Fluid injection in a borehole causes perturbations of the pore pressure in rocks. Such perturbations cause a change of the effective stress, which, if large enough, can trigger earthquakes along pre-existing zones of weakness. The SBRC approach considers that most of the seismicity is triggered along critically stressed, pre-existing fractures. According to this hypothesis the SBRC uses a spatio-temporal analysis of fluid-injection induced microseismicity to reconstruct the tensor of hydraulic diffusivity and to estimate the tensor of permeability in 3D. The SBRC approach was successfully applied to real data several times. However, processes that can lead to triggering of microseismicity are not yet fully understood. A correlation of microseismic hypocenters with structural images obtained from reflection seismics can help to better understand the physics of microseismicity triggering and thus to test the main assumption of the SBRC. Recently, fluid injection induced microseismicity at the German Continental Deep Drilling site (KTB) was analysed in terms of the SBRC method to reconstruct the tensor of permeability at the open hole section at 9.1 km depth. Using new data sets acquired in 2000 we are able to observe indications of the depth-dependency of hydraulic diffusivity at the KTB for the first time. The analysis of fluid-induced microseismicity leads to an estimation of the hydraulic diffusivity at the KTB at different depths. A lower value of hydraulic diffusivity was found in upper parts of the subsurface compared with the values at the open-hole section. Correlations with structural images were obtained. For example, we observe that rock volumes characterized by larger diffusivity also show larger reflectivity.

  18. Formation damage studies of lubricants used with drill-in fluids systems on horizontal open-hole wells 

    E-print Network

    Gutierrez, Fernando A

    2000-01-01

    . , cause no flocculation, etc. (b) The product must be tested for lubricity. (c) The return permeability tests must be done and no formation damage should be present. (d) It must be environmentally acceptable. Figure 1 - Frictional Forces Acting on a... requirements as defined as follows: (a) it must be compatible with drilling fluids i. e. , cause no flocculation, etc. (b) The product must be tested for lubricity. (c) The return permeability tests must be done and no formation damage should be present...

  19. The multiphase flow system used in exploiting depleted reservoirs: water-based Micro-bubble drilling fluid

    NASA Astrophysics Data System (ADS)

    Li-hui, Zheng; Xiao-qing, He; Li-xia, Fu; Xiang-chun, Wang

    2009-02-01

    Water-based micro-bubble drilling fluid, which is used to exploit depleted reservoirs, is a complicated multiphase flow system that is composed of gas, water, oil, polymer, surfactants and solids. The gas phase is separate from bulk water by two layers and three membranes. They are "surface tension reducing membrane", "high viscosity layer", "high viscosity fixing membrane", "compatibility enhancing membrane" and "concentration transition layer of liner high polymer (LHP) & surfactants" from every gas phase centre to the bulk water. "Surface tension reducing membrane", "high viscosity layer" and "high viscosity fixing membrane" bond closely to pack air forming "air-bag", "compatibility enhancing membrane" and "concentration transition layer of LHP & surfactants" absorb outside "air-bag" to form "incompact zone". From another point of view, "air-bag" and "incompact zone" compose micro-bubble. Dynamic changes of "incompact zone" enable micro-bubble to exist lonely or aggregate together, and lead the whole fluid, which can wet both hydrophilic and hydrophobic surface, to possess very high viscosity at an extremely low shear rate but to possess good fluidity at a higher shear rate. When the water-based micro-bubble drilling fluid encounters leakage zones, it will automatically regulate the sizes and shapes of the bubbles according to the slot width of fracture, the height of cavern as well as the aperture of openings, or seal them by making use of high viscosity of the system at a very low shear rate. Measurements of the rheological parameters indicate that water-based micro-bubble drilling fluid has very high plastic viscosity, yield point, initial gel, final gel and high ratio of yield point and plastic viscosity. All of these properties make the multiphase flow system meet the requirements of petroleum drilling industry. Research on interface between gas and bulk water of this multiphase flow system can provide us with information of synthesizing effective agents to enlarge the application of micro-bubble in petroleum industry.

  20. EFFECT OF WELL-DRILLING FLUIDS OF THE PHYSIOLOGICAL STATUS AND MICROBIAL INFECTION OF THE REEF BUILDING CORAL 'MONTASTREA ANNULARIS'

    EPA Science Inventory

    The reef building coral Montastrea annularus was exposed continuously to suspensions of oil and gas-well drilling fluids at concentrations of 0.1 ml/liter, 0.01 ml/liter, and 0.0001 ml/liter in flowing seawater at the U.S. Naval Stage I platform (30 deg 7.5 min N, 85 deg 46.3 min...

  1. Reduction of erosion rate by particle size distribution ( PSD) modification of hematite as weighting agent for oil based drilling fluids

    Microsoft Academic Search

    G. Quercia; R. Belisario; R. Rengifo

    2009-01-01

    Natural hematite (Fe2O3) and barite (Ba2SO4) are usually employed as weighting agents for oil based drilling fluids in several venezuelan fields. Hematite has shown some physico-chemical advantages with respect to barite: a greater specific gravity and solubility in acid media and lower attrition rate. However, the most challenging issue related to hematite field applications has been to reduce its high

  2. Paleofluids and Recent fluids in the upper continental crust: Results from the German Continental Deep Drilling Program (KTB)

    NASA Astrophysics Data System (ADS)

    MöLler, P.; Weise, S. M.; Althaus, E.; Bach, W.; Behr, H. J.; Borchardt, R.; BräUer, K.; Drescher, J.; Erzinger, J.; Faber, E.; Hansen, B. T.; Horn, E. E.; Huenges, E.; KäMpf, H.; Kessels, W.; Kirsten, T.; Landwehr, D.; Lodemann, M.; Machon, L.; Pekdeger, A.; Pielow, H.-U.; Reutel, C.; Simon, K.; Walther, J.; Weinlich, F. H.; Zimmer, M.

    1997-08-01

    The two German Continental Deep Drilling Program (KTB) boreholes provided samples for studies of fluid inclusions (paleofluids), "free fluids" of the crystalline basement, and their fingerprints on the chemical and isotopic composition of minerals and rocks to 9101 m depth, which allowed reconstruction of the evolution of fluids, their migration pathways, and their sources. Aqueous fluids were largely lost during the Devonian amphibolite facies metamorphism. Thereafter, radiogenic, nucleogenic, and fissiogenic gases, together with NH4-fixed nitrogen, were released from host rocks and partly enclosed in secondary inclusions. During the Hercynian uplift, Na-Cl fluids (formation water) infiltrated and dissolved noble gases and N2 largely originating from the host rocks. In the course of the Cretaceous denudation, high-salinity Ca-Na-Cl brines, possibly derived from Permo-Carboniferous sediments but altered by fluid/rock interaction, migrated into their present position. This fluid introduced low-maturity hydrocarbons released together with nitrogen from early metamorphic organic-rich sediments. The 4000-m fluid from the KTB pilot hole pumping test, which was analyzed chemically and isotopically, seems to be a mixture of an ascending basement brine and a descending paleometeoric water, from which the late alteration minerals calcite and laumontite precipitated in fractures. The calcite is neither chemically nor isotopically in equilibrium with the recovered "free fluid." Hydraulic tests indicate a communicating system of fractures between the boreholes with a distinct matrix and fracture porosity.

  3. Laboratory tests, statistical analysis and correlations for regained permeability and breakthrough time in unconsolidated sands for improved drill-in fluid cleanup practices 

    E-print Network

    Serrano, Gerardo Enrique

    2000-01-01

    LABORATORY TESTS) STATISTICAL ANALYSIS AND CORRELATIONS FOR REGAINED PERMEABILITY AND BREAKTHROUGH TIME IN UNCONSOLIDATED SANDS FOR IMPROVED DRILL-IN FLUID CLEANUP PRACTICES A Thesis GERARDO ENRIQUE SERRANO Submitted to the Office of Graduate... AND BREAKTHROUGH TIME IN UNCONSOLIDATED SANDS FOR IMPROVED DRILL-IN FLUID CLEANUP PRACTICES A Thesis by GERARDO ENRIQUE SERRANO Submitted to Texas A&M University in partial fulfillment of the requirements for the degree of MASTER OF SCIENCE Approved...

  4. Abnormal fluid pressures and fault-zone dilation in the Barbados accretionary prism: Evidence from logging while drilling

    NASA Astrophysics Data System (ADS)

    Moore, J. C.; Shipley, T. H.; Goldberg, D.; Ogawa, Y.; Filice, F.; Fisher, A.; Jurado, M.-J.; Moore, G. F.; Rabaute, A.; Yin, H.; Zwart, G.; Brückmann, W.; Henry, P.; Ashi, J.; Blum, P.; Meyer, A.; Housen, B.; Kastner, M.; Labaume, P.; Laier, T.; Leitch, E. C.; Maltman, A. J.; Peacock, S.; Steiger, T. H.; Tobin, H. J.; Underwood, M. B.; Xu, Y.; Zheng, Y.

    1995-07-01

    Logs collected while drilling measured density in situ, through the accretionary prism and decollement zone of the northern Barbados Ridge. Consolidation tests relate void ratio (derived from density) to effective stress and predict a fluid pressure profile, assuming that the upper 100 m of the prism is at a hydrostatic pressure gradient. The calculated fluid pressure curve rises to >90% of lithostatic below thrusts in the prism, presumably due to the increase in overburden and lateral tectonic loading. Thin (0.5 2.0 m) intervals of anomalously low density and resistivity in the logs through the basal decollement zone suggest dilation and perhaps hydrofracturing. A peak in hydraulic head in the upper half of the decollement zone requires lateral influx of fluid, a conclusion consistent with previous geochemical studies. Although the calculated fluid-pressure profile is model dependent, its inherent character ties to major structural features.

  5. WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS

    Microsoft Academic Search

    Jill S. Buckley; Norman r. Morrow

    2002-01-01

    This first semiannual report covers efforts to select the materials that will be used in this project. Discussions of crude oils, rocks, smooth mineral surfaces, and drilling mud additives are included in this report.

  6. WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS

    SciTech Connect

    Jill S. Buckley; Norman r. Morrow

    2002-06-01

    This first semiannual report covers efforts to select the materials that will be used in this project. Discussions of crude oils, rocks, smooth mineral surfaces, and drilling mud additives are included in this report.

  7. Effects of fluids on faulting within active fault zones - evidence from drill core samples recovered during the San Andreas Fault Observatory at Depth (SAFOD) drilling project

    NASA Astrophysics Data System (ADS)

    Janssen, C.; Wirth, R.; Kienast, M.; Morales, L. G.; Rybacki, E.; Wenk, H.; Dresen, G. H.

    2011-12-01

    Low temperature microstructures observed in samples from SAFOD drill cores indicate fluid-related deformation and chemical reactions occurring simultaneously and interacting with each other. Transmission Electron Microscopy (TEM) observations, document open pores that formed in-situ during or after deformation. In TEM images, many pores with high aspect ratio appear to be unconnected. They were possibly filled with formation water and/or hydrothermal fluids suggesting that elevated pore fluid pressure exist in the fault gouge, preventing pore collapse. The chemical influence of fluids on mineralogical alteration and geomechanical processes in fault rocks is visible in pronounced dissolution-precipitation processes (stylolites, solution seams) as well as in the formation of new phases. Detrital quartz and feldspar grains are partially dissolved and replaced by authigenic illite-smectite (I-S) mixed-layer clay minerals. TEM imaging of these grains reveals that the alteration processes initiated within pores and small intra-grain fissures. In few samples syntectonic fluid-assisted overgrowth of chlorite-rich films on slickensides partly replaced sedimentary quartz grains. Quartz and feldspar grains are partially dissolved with sutured boundaries. Newly-formed phyllosilicates are illite-smectite phases, Mg-rich smectites and chlorite minerals. They are very fine-grained (down to 20 nm) and nucleate at grain surfaces (interfaces), which in many cases are pore or fracture walls. These relatively straight or curved crystals grow into open pore spaces and fractures. They are arranged in a card-house fabric with open pore spaces between the flakes. Locally, clay flakes are bent, folded or show sigmoidal shapes indicating that they were involved in faulting. The clay particles do not show a preferred shape orientation. The predominantly random orientation distribution of the clay minerals was confirmed by x-ray synchrotron texture analysis. Pole figures show very weak textures with maxima around 1.2 m.r.d. and minima around around 0.8 m.r.d., indicating that a majority of crystals are oriented randomly. The dominance of randomly oriented clay particles, characterized by weak fabrics, may influence the mechanical stability of fault zone rocks. Formation of secondary calcite cement reveals fluid-assisted fracture healing. Cathodoluminescence microscopy shows at least three different generations of calcite veins confined to lithoclasts, displaying dissolution seams. Additionally, crack and seal processes in K-feldspar are identified. The calcite grains exhibit different degrees of deformation with evidence for twinning and crystal plasticity.

  8. Research on drilling fluids and cement slurries at Standard Oil Production Company: an internship report

    E-print Network

    Flipse, Eugene Charles, 1956-

    2013-03-13

    . An experienced mud engineer can judge the quality of an oil mud by looking at the sheen on the surface of the mud. The smell can reveal decomposition of water wet emulsifiers and viscosifiers. The ability of the oil mud to wet the skin gives another... attended a solids separation technology seminar presented by Geolograph Pioneer. They presented the most common methods for separating drill solids from the drilling mud. These methods included hydrocyclones, centrifuges and seive screens. Methods...

  9. Iceland Deep Drilling Project (IDDP): (8) A Fluid Inclusion Study of Magmatic Gases at the Krafla Geothermal Field

    NASA Astrophysics Data System (ADS)

    Owens, L. B.; Mortensen, A.; Gudmunsson, A.; Elders, W. A.; Fridleifsson, G. O.

    2009-12-01

    Geothermal production in Krafla has a history of problems due to contamination by magmatic gases causing increased NCGs as well as forming highly acidic production fluids responsible for corrosion of casing. Recent drilling of well KJ-39 and IDDP-1 encountered a fresh magma body at depth, exemplifying this risk. Multiple wells from the Krafla geothermal field in NE Iceland were investigated to identify regions of elevated magmatic gas compositions. Cold-crush fluid inclusion gas analyses were performed on well cuttings collected at 50m intervals using a quadrapole mass spectrometer analyzing for major compounds including H2, He, CH4, H2O, N2, O2, H2S, Ar, O2, SO2 and C1-C4 alkanes and alkenes, cyclopentane, toluene and benzene. Well KJ-39 encountered a magmatic intrusion of intermediate composition at approximately 2800m depth. Elevated mol% CO2 and total gas compositions (>60%) in fluid inclusions are observed from 2300m and increase exponentially nearing the intrusion. Anomalously high He/(Ar+N2) values are observed from a feed zone at 2650m (R=2.8) indicative of a mantle-rich gas component. Quenched glass from the intrusion exhibit elevated N2/Ar ratios (~190) resembling arc-type magmatic volatile compositions. This is unexpected in Icelandic magmas hence contamination from drilling fluids may be suspected. Well KJ-17 is located in close proximity to the well KJ-39, yet appears to be uninfluenced by the magmatic intrusion found below, exhibiting lower mol% CO2 and total gas compositions in the trapped fluids at comparable depths. The dynamics of magmatic gas contamination in this region appear to be strongly compartmentalized or are the result of more recent intrusions of shallow magmas in the area. Well KJ-25 is located adjacent to the site of IDDP-1, which also encountered a rhyolitic intrusion at 2104m in spring 2009. CO2 mol%, H2 mol % and total gas concentrations in KJ25 are elevated from 1850m towards bottom hole, indicative of a possible magmatic intrusion at depth, similar to KJ-39. The melt intrusion encountered in IDDP-1 may extend laterally below KJ-25 which would explain this gas signature. Fluid inclusion analysis of IDDP-1 cuttings and vein material are ongoing to determine the gas signatures associated with the interaction of fresh magma and geothermal production fluids. For all wells studied, H2 gas geothermometers based on fluid inclusion gas compositions parallel temperature profiles presented by alteration mineral assemblages recording higher temperatures in the past, particularly above 1500m. CO2 gas geothermometers more reflect modern formation temperatures, corresponding with calcite overprinting in cooler zones.

  10. Real-Time Fluid and Gas Monitoring During Drilling of the SAFOD Main Hole in Parkfield, CA.

    NASA Astrophysics Data System (ADS)

    Wiersberg, T.; Erzinger, J.

    2005-12-01

    Little is known about the role and origin of fluids and gases associated with the San Andreas Fault zone (SAF). To gain information on fluids and gases at depth, we performed real-time mud gas monitoring during drilling of the SAFOD (San Andreas Fault Observatory at Depth) Pilot Hole (PH) and Main Hole (MH). Gas extracted from returning drill mud was piped into a nearby laboratory trailer and analyzed on-line. Permanent gases were detected using a portable mass spectrometer, hydrocarbons with a gas chromatograph, and the 222Rn-activity with a Lucas-Cell detector. When significant amounts of non-atmospheric gases were detected, off-line gas samples were collected from the gas line for further isotope studies. The SAFOD PH and MH were drilled in only a few meter distance, but in contrast to the straight PH, which penetrates through 768 m of sediments into granites down to 2168 m target depth (TD), the nearby MH is deviated towards the SAF and returns into sedimentary strata below 1930 m. The MH drilled sedimentary rocks down to 3987 m TD, approximately 45 m northeast of the surface trace of the SAF. From surface to 1930 m, the depth distribution of gas is similar for SAFOD PH and MH. Shear zones, identified by geophysical logging, are often characterized by elevated concentrations of CH4, CO2, H2, Rn, and He. The same gases were found in the MH below 1930 m, but their concentrations were, with the exception of He, significantly higher: CH4, CO2, and H2 sometimes reach several volume percent. Generally, the gas composition is partly controlled by the lithology. Variation in the methane concentration in several depth intervals reflects the changes in lithology from low gas abundance in clays and silts to more gas rich shales, which are the source rocks for hydrocarbons. Highly porous and permeable sandstone yield the highest concentrations of hydrocarbons (up to 15 vol% methane), and may be regarded as reservoir rocks. We interpret high radon activities in mud gas as indicator for circulating fluids entering the borehole via fractures. These fluids are also rich in hydrocarbons, carbon dioxide, and hydrogen, but only low concentrated in helium. Such intervals could be identified in several depth intervals (2675-2750 m, 2825-2900 m, and 3550-3650 m depth, and below 3700 m). The hydrocarbons in the surrounding rocks show a similar composition as those associated with fault zones. In addition to the low helium concentration, these results demonstrate fluid migration from the nearby with only little evidence for gas migration from a deeper source. A striking observation is the high amount of hydrogen found in these intervals. We can exclude a significant contribution of artificial hydrogen (drilling artifact) and mantle hydrogen. From soil gas studies, it is known that fault zones sometimes show enhanced concentration of hydrogen. As a possible source of hydrogen, the interaction of water with freshly ground rock, caused by fault zone movement, is discussed. Isotopic studies on hydrogen in combination with laboratory experiments are ongoing to test hydrogen synthesis by rock-water interaction. First isotopic studies on ?13C of methane indicate mixing of microbial methane with only small amounts of methane generated by thermal degradation of organic matter in the shallower depth (down to ~2500 m). Below this depth, the concentration of heavy hydrocarbons increases. CH4/(C2H6+C3H8) significantly drops from >100 to values <30 towards the bottom of the MH, and, methane becomes isotopically heavier, which is more typical for thermogenic hydrocarbons.

  11. Axial flow turbine drill for earth boring

    Microsoft Academic Search

    1971-01-01

    A downhole axial flow turbine to rotate the drilling bit in earth boring is described. The turbine is actuated by drilling fluid flow. The turbine operates in conjunction with dual-tube drill pipe. The drilling fluid flows downward in the annulus of the dual-tube drill pipe, through the annulus of the turbine, actuating the turbine, through the bit, ascending through the

  12. Thermoporoelastic Effects of Drilling Fluid Temperature on Rock Drillability at Bit/Formation Interface 

    E-print Network

    Thepchatri, Kritatee 1984-

    2012-10-26

    .......................................................... 12 2.3 Rock Failure and Bit-Rock Drilling Mechanisms ......................................... 21 2.4 Fourier-Assisted Finite-Element Method ...................................................... 26 CHAPTER III FUNDAMENTAL CONCEPTS... in the Fourier-series form which allows an application of Fourier-Assisted Finite-Element technique. .......................................... 67 Figure 5.4 Diagram explains superposition technique to solve the Fourier-series boundary stresses problem...

  13. Evaluation of local bentonitic clay as oil well drilling fluids in Nigeria

    Microsoft Academic Search

    O. A. Falode; O. A. Ehinola; P. C. Nebeife

    2008-01-01

    Rheological and filtration tests were carried out on bentonitic samples obtained from Pindiga Formation in Borno Basin and the commercial Wyoming bentonite using a Rheometer and API Filter Press respectively. This is to evaluate the performance of the local clays for drilling operations in Nigeria.The free swell volume, gel strength, filtration and rheological properties of Pindiga mud improved as clay

  14. Reactive fluid transport in CO2 reservoir caprocks: constraints from scientific drilling of a natural CO2 reservoir

    NASA Astrophysics Data System (ADS)

    Kampman, N.; Bickle, M. J.; Bertier, P.; Busch, A.; Chapman, H.; Evans, J. P.; Graham, C.; Harrington, J.; Maskell, A.

    2013-12-01

    The long-term performance of reservoir caprocks in geological CO2 storage sites remains uncertain due to the poorly constrained nature of field-scale fluid-mineral reaction kinetics and CO2 transport processes in low permeability rocks. Predicting the nature, rates and impacts of CO2 penetration into the caprocks from numerical modelling studies maybe undermined by their reliance on laboratory derived reaction kinetics from short-term experiments, and the complexity of the coupled reactive transport processes at the nano- and micro-scale. We report here on the early results from scientific drilling and laboratory analysis of the caprocks of a stacked sequence of natural CO2 reservoir at Green River, Utah. In summer 2012, diamond drilling to a depth of 325m, adjacent to a CO2 degassing normal fault recovered core from two major CO2 reservoirs in the Entrada and Navajo Sandstones and from the intervening Carmel Formation regional caprock. In-situ pH, CO2 concentrations and fluid element and isotope geochemistry were determined from wireline downhole sampling of pressurized fluids from the reservoirs. The fluid geochemistry provides important constraints on reservoir filling by flow of CO2-charged brines through the fault damage zone, macro-scale fluid flow in the reservoirs and the state of fluid-mineral thermodynamic disequilibrium from which the nature of the fluid-mineral reactions can be interpreted. Mineralogical, geochemical and petrophysical profiles through portions of the caprocks in contact with the CO2-charged reservoirs have been used to constrain the nature and penetration depths of the CO2-promoted fluid-mineral reaction fronts. The major reactions are the dissolution of diagenetic dolomite cements and hematite grain coatings which generate porosity in the caprocks. Analysis of the generated pore structure from a variety of analytical techniques will be discussed. Stable C- and O-isotopic shifts in the composition of the carbonate cements record their dissolution-recrystallization and transport of the isotopic composition of the CO2-charged fluids into the caprocks. The mineralogical profiles combined with advective-diffusive modelling are used to constrain the rates of the fluid-mineral reactions and the propagation velocity of the reaction fronts. These reaction fronts penetrate the seals on length-scales of centimetres to tens of centimetres over the ~400,000 year history of the site, with the reservoir ages constrained by U-Th dating of carbonate veins deposited in the CO2 degassing faults. This analysis attests to the important role that fluid-mineral reactions have on retarding the reaction front velocity, limiting the impact of the CO2-charged fluids on porosity generation and degradation of the caprock geomechanical strength.

  15. The Iceland Deep Drilling Project (IDDP): (4) A Quartz Fluid Inclusion Tool for Sampling Supercritical Geothermal Fluids Downhole

    NASA Astrophysics Data System (ADS)

    Reed, M. H.; Grist, H.; Fridriksson, T.; Danielsen, P.; Senkovich, D.; Johnston, A.; Elders, W. A.; Fridleifsson, G. O.

    2009-12-01

    Chemical analyses of in situ samples of supercritical geothermal fluids would provide a uniquely good measure of fluid composition at depth relative to compositions reconstructed from analyses of gas and liquid sampled at wellheads. Fluids sampled at the wellhead are commonly a mixture from multiple aquifers and, in many circumstances, they lack components such as sulfate, sulfide, Ca, Cu, Zn, and Fe that precipitated in scale minerals where the fluids boiled or cooled during their ascent. To circumvent the above problems and the failings of downhole mechanical samplers at temperatures exceeding 300°C and to obtain total fluid samples at supercritical conditions in the IDDP wells, we plan to trap fluids in fluid inclusions formed in fractured quartz that we suspend in a geothermal well on a wireline. In a series of hydrothermal laboratory experiments at 450°C and 600 bar and spanning 6 hr to 5 days in length, thermal shock fractures in natural and synthetic quartz crystals heal, forming ragged fluid inclusions in one day and many well formed inclusions in three days. Amorphous silica is added to the experimental charge, without which, fractures heal little and only 1-2 micron inclusions form. Microthermometry measurements on the inclusions produced in experiments return the run temperature within 20°C at the experimental pressure, indicating that inclusions formed and sealed at the run conditions. The fluid inclusion tool (FIT) consists of a perforated stainless steel pipe containing multiple stainless steel mesh canisters with non-mesh ends to minimize vertical fluid flow. The canisters contain 10mm-scale chunks of fractured quartz surrounded by ground quartz glass. The perforated pipe will be fixed within a one-meter outer perforated stainless steel housing that is suspended on a stainless steel slick line. The FIT is weighed by one or more 10kg lead sinker bars. The entire assembly is lowered into the well from a lubricator fitted on the wellhead, thus enabling sampling under high temperatures and pressures. In the initial field testing runs, the contents of the mesh canisters will be varied to examine the effects of ground glass grain size, and the suitability of clear natural quartz vs synthetic quartz, both with respect to fluid inclusion development and chemical analyses of inclusions. Inclusions will be analyzed by various bulk methods and by LA-ICP-MS on individual inclusions. Once we optimize the fluid inclusion tool configuration in field tests and by analytical results, the volume of sampling quartz can be scaled up as needed to provide for optimum sampling and analyses.

  16. Drilling fluid conversion: Selection and use of Portland or blast-furnace-slag cement

    SciTech Connect

    Schlemmer, R.P.; Branam, N.E.; Edwards, T.M.; Valenziano, R.C.

    1994-12-01

    Conversion of drilling mud to oilwell cement has advanced from an unpredictable laboratory curiosity to a practical reality. Recent field introduction of polymer dispersants, organic accelerators, and an alternative cementitious material have provided two refined and practical conversion methods. Each method claims universal applicability plus performance superior to that of conventionally mixed and pumped Portland cement. Both blast-furnace-slag (BFS) and Portland cement are used for drilling-mud conversion. Portland and BFS mud conversions can use the same recently developed polymer dispersants, filtration-control materials, defoamers, and other additives that are typically used to treat high-temperature, highly-salt-contaminated drilling muds. Experience in the field and laboratory has demonstrated that conversion with BFS or Portland cement is essentially one technology from a pilot-test and application standpoint. While use of these two materials reflects essentially one technology, distinct performance and cost differences exist. These differences define the specific economic application advantages and must be considered when a decision to use BFS or Portland cement is made. Rational selection of mud-to-cement conversion depends on a detailed economic comparison of basic materials, logistics, and equipment availability.

  17. EFFECTS OF OIL AND GAS WELL-DRILLING FLUIDS ON THE BIOMASS AND COMMUNITY STRUCTURE OF MICROBIOTA THAT COLONIZE SANDS IN RUNNING SEAWATER

    EPA Science Inventory

    Well-drilling fluid and a number of the known components (barite, clay, Aldacide, Surflo, and Dowicide, were tested for effects on the biomass and community structure of the microbiota that colonize marine sands exposed for eight weeks to running ambient seawater. Shading the mic...

  18. Trade-offs in traditional criteria vs environmental acceptability in product development: an example of the drilling fluids industry's response to environmental regulations

    Microsoft Academic Search

    M. Jones; C. Collins; D. Havis

    1980-01-01

    The coevolution of increased energy needs and a heightened environmental awareness within the past decade has been fraught with direct conflicts. Often, these conflicts were necessary to solidify boad policy acts or challenge nebulous or unclear regulations. The drilling fluids industry, a vital part of petroleum exploration and production, has recognized the need for avoiding future conflicts and for insuring

  19. Effects of non-aqueous fluids-associated drill cuttings discharge on shelf break macrobenthic communities in the Campos Basin, Brazil.

    PubMed

    Santos, Maria Fernanda L; Silva, Janete; Fachel, Jandyra M G; Pulgati, Fernando H

    2010-08-01

    This paper assesses the effects of non-aqueous fluids (NAF)-associated drill cuttings discharge on shelf break macrobenthic communities in the Campos Basin, off the southeast Brazilian coast, Rio de Janeiro State. Samples were taken with a 0.25-m2 box corer from surrounding two oil and gas wells on three monitoring cruises: before drilling, three months after drilling, and 22 months after drilling. Statistical methodologies used Bayesian geostatistical and analysis of variance models to evaluate the effects of the NAF-associated drill cuttings discharge and to define the impact area. The results indicated that marked variations were not observed in the number of families between cruises, though there were changes in the fauna composition. The changes seen in biological descriptors in both control and background situation areas were not considered significant, showing a temporal homogeneity in means. The impact area presented changes in biological descriptors of communities and trophic structure during the three cruises and such changes were correlated to chemical and physical variables related to the drilling activities, as a result of the mix of drill cuttings and sediment and the anoxic conditions established in the substrate. In that area, three months after drilling, a decrease in diversity and an increase in density, motile deposit-feeders and Pol/Crp ratio, and dominance of opportunistic organisms, such as the capitellid Capitella sp., were observed and, 22 months after drilling, an increase of diversity, reduction of dominance of capitellid polychaete, changes in the fauna composition, and a dominance of opportunistic burrowing and tube-building organisms were observed, indicating an ecological succession process. PMID:20524059

  20. WETTABILITY AND PREDICTION OF OIL RECOVERY FROM RESERVOIRS DEVELOPED WITH MODERN DRILLING AND COMPLETION FLUIDS

    SciTech Connect

    Jill S. Buckley; Norman R. Morrow

    2002-12-01

    We report on a preliminary study of wetting effects of synthetic oil-based mud components on the wetting of mica surfaces using drilling mud fractions obtained from two wells drilled with synthetic oil-based muds (SBM). We have used these SBM fractions, one a filtrate and the other a centrifugate, to develop testing protocols for studies on smooth mica surfaces. Both SBM fractions changed the wetting of clean, dry mica surfaces, making them preferentially oil-wet. Solvents were tested to clean the mica with varying degrees of success. In tests designed to simulate contact between SBM fractions and reservoir pore surface, changes of wetting of mica that had previously been exposed to brine and crude oil were examined using six different crude oils in combination with several different brine formulations. Four of the six oils produced preferentially water-wet surfaces whereas two produced fairly oil-wet conditions on mica. Exposure to the SBM fractions tended to increase decane/water advancing contact angles on the more water-wet surfaces and to decrease those on the more oil-wet surfaces. Cleaning solvents were compared for their efficacy and the possibility of wettability restoration was examined for some of the cleaned surfaces.

  1. Controlling barite sag can reduce drilling problems

    Microsoft Academic Search

    M. Zamora; D. Jefferson

    1994-01-01

    A new method for tracking drilling fluid density variations helps detect barite sag, which may contribute to drilling problems. The method is based in part on continuously measuring fluid density during the first circulation after the fluid has been static for some time. In deviated wells or wells with weighted fluids, barite sag has aggravated or caused drilling problems such

  2. The Iceland Deep Drilling Project (IDDP): Deep Fluid Sampling in Fractured Quartz, Reykjanes Geothermal System, Iceland

    NASA Astrophysics Data System (ADS)

    Seward, R. J.; Reed, M. H.; Grist, H. R.; Fridriksson, T.; Danielsen, P.; Thorhallsson, S.; Elders, W. A.; Fridleifsson, G. O.

    2011-12-01

    In July of 2011 a fluid inclusion tool (FIT) was deployed in well RN-17b of the Reykjanes geothermal system, Iceland, with the goal of sampling fluids in situ at the deepest feed point in the well. The tool consists of a perforated stainless steel pipe containing eight stainless steel mesh canisters, each loaded with 10mm-scale blocks of thermally fractured quartz. Except for one control canister, in each canister the fractured quartz blocks were surrounded by a different grain size of SiO¬2 glass that ranged in size from 10?m-scale glass wool to cm-scale glass shards. The FIT was left in the well on a wireline at a depth of 2768m and retrieved after three weeks. The fluid at 2768m depth is known from November 2010 well logs to have a temperature of about 330°C and pressure of 170 bars, a pressure ~40 bar too high for boiling at that temperature. After retrieval, quartz in all of the canisters contained liquid-dominated fluid inclusions, but their quantity and size differed by canister. Groups of inclusions occur in healed fractures and both healed and open fracture surfaces are visible within single quartz blocks. Measurements on a heating and cooling stage yield approximant inclusion homogenization temperatures of 332°C and freezing points of -2.0°C. These measurements and a pressure of 170 bars yield trapping temperatures of 335°C and a NaCl weight percent of 3.4, both of which match known values, thus verifying that the device trapped fluids as intended. In upcoming studies, these fluids will be analyzed using bulk methods and LA-ICP-MS on individual inclusions. The glass added to the quartz blocks in the canisters allowed the Reykjanes fluids to precipitate enough quartz to heal fractures and trap fluids despite the fluid undersaturation in quartz. Almost all of the glass that was added to the canisters, 27 to 66 grams in each (except glass wool), was consumed in the experiment. Remaining glass was in the non-mesh bottom caps of the canisters where fluid flux may have been minimal, indicating that most of the dissolved SiO2 was carried away with flowing fluid. This may explain why not all fractures were healed, as they were in our previous closed-system laboratory experiments. Upon recovery from the well, the FIT and the canister contents were covered in fine black particles, the greatest quantity by far occurring in canisters that had contained glass wool as the SiO2 source. Preliminary SEM-EDS analyses show that the particles contain silica, iron, magnesium, and small amounts of zinc sulfide. The precipitation of sulfides from the fluid sampled in the quartz fractures provides a valuable constraint on interpretation of the fluid inclusion compositions.

  3. An integrated experimental approach for evaluating formation damage due to drilling and completion fluids

    SciTech Connect

    Longeron, D.; Argillier, J.F.; Audibert, A.

    1995-12-31

    The paper describes an experimental approach to study the formation damage induced by drilling muds in oil bearing formations. This approach includes (i) static and dynamic invasion tests on long core samples performed either under CT Scanning or with specific equipment allowing pressure measurements along the core sample, and (ii) characterization of both external and internal mud cakes by means of Cryo-SEM examinations. A series of seven water-based mud invasion experiments has been conducted on high permeability clayey sandstones. The amount and the extent of formation damage have been quantified. The results show that global oil return permeabilities vary from 44% to 90% of initial permeability depending on oil viscosity and overbalance pressure. Hysteresis of saturations due to retention of invaded aqueous filtrate was always observed, up to 17 saturation units. This induced an adverse relative permeability effect which may significantly contribute to oil permeability impairment.

  4. Blade stabilizer provided with at least one fluid passage having a venturi effect, in particular for use in combination with a drill bit

    SciTech Connect

    Boulet, J.; Cholet, H.

    1981-01-20

    A stabilizer for a tool, such as a rotary drill bit, comprises at least two blades spaced radially about the axis of the tool. Two adjacent blades define a venturi-shaped free angular space for a flow of drilling fluid. The width of each of the blades increases over at least a first portion, measured from the lower end of the blade, of the height of each blade. The height of the first portion is at least equal to one half of the width of the lower end of the free angular space.

  5. Fluid Inclusions in Salton Sea Scientific Drilling Project Core: Preliminary Results

    NASA Astrophysics Data System (ADS)

    Roedder, Edwin; Howard, Kevin W.

    1988-11-01

    Fluid inclusions (191) in calcite, quartz, K-feldspar, and epidote from ?l-mm veinlets in cores and well cuttings from 604-2560 m homogenize from 217° to >500°C and vary widely in salinity, suggesting a complex history of fluids surrounding these samples. No daughter minerals were seen, and no clathrates were recognized on freezing. Vapor-rich inclusions under pressure, presumably containing CO2 and/or CH4, were found from a wide range of depths, suggesting that effervescence has occurred. Low-salinity fluids (1.2 -4.0 wt % NaCl eq) were present as deep as 1939 m. The data can be explained by a combination of processes such as thermal metamorphism of evaporites and other sediments and mixing of water from metamorphic dehydration reactions with partly evaporated Colorado River water.

  6. Correlation of fluid induced Microseismicity with Reflectivity at the German Continental Deep Drilling Site (KTB)

    Microsoft Academic Search

    E. Rothert; S. A. Shapiro; M. Bohnhoff

    2003-01-01

    An approach for the interpretation of microseismic data occuring during borehole fluid injections was earlier proposed to provide in-situ estimates of the hydraulic diffusivity characterizing a geothermal or hydrocarbon reservoir on the large spatial scale (on the order of 10^3m). This approach is called \\

  7. Experimental Analysis of Water Based Drilling Fluid Aging Processes at High Temperature and High Pressure Conditions 

    E-print Network

    Zigmond, Brandon

    2012-10-19

    ingredient functional categories (NRC 1983) Functional Categories Weighting materials Viscosifiers Thinners, dispersants Alkalinity, pH control additives Batercides Calcium reducers Corrosion inhibitors Defoamers Emulsifiers Filtrate reducers Flocculants... and engineered to be suitable for HT/HP environments. Typical WBMs contain water, clay, and a variety of additional components to control fluid loss and rheological stability. Almost all formulated WBMs consist of weighting materials, viscosifiers, thinners...

  8. Experimental Assessment of Water Based Drilling Fluids in High Pressure and High Temperature Conditions 

    E-print Network

    Ravi, Ashwin

    2012-10-19

    : : : : : : : : : : 43 2.13 Types of Clay Association : : : : : : : : : : : : : : : : : : : : : : : : 45 2.14 Possible Flocculation Geometries : : : : : : : : : : : : : : : : : : : : 45 2.15 Action of De occulation Agents : : : : : : : : : : : : : : : : : : : : : 46... Solutions : : 74 4.7 Overall Test Results for Fluid with 60 PPB Barite : : : : : : : : : : 76 4.8 Temp. vs Dial Reading Graph for 60 PPB Barite Solution : : : : : : 77 4.9 E ect of Solids Content on WBM Flocculation Temperature : : : : : 78 4...

  9. Experimental Analysis of Water Based Drilling Fluid Aging Processes at High Temperature and High Pressure Conditions

    E-print Network

    Zigmond, Brandon

    2012-10-19

    ingredient functional categories (NRC 1983) Functional Categories Weighting materials Viscosifiers Thinners, dispersants Alkalinity, pH control additives Batercides Calcium reducers Corrosion inhibitors Defoamers Emulsifiers Filtrate reducers Flocculants... and engineered to be suitable for HT/HP environments. Typical WBMs contain water, clay, and a variety of additional components to control fluid loss and rheological stability. Almost all formulated WBMs consist of weighting materials, viscosifiers, thinners...

  10. Downhole fluid sampling and noble gas analysis of saline waters from the Outokumpu Deep Drill Hole, Finland

    NASA Astrophysics Data System (ADS)

    Wiersberg, Thomas; Kietäväinen, Riikka; Ahonen, Lasse; Kukkonen, Ilmo; Niedermann, Samuel

    2014-05-01

    The 2516 m deep Outokumpu Deep Drill Hole is situated at the NW-SE trending boundary between the Archaean and Proterozoic domains of the eastern Fennoscandian Shield (Finland). In August 2011, eight fluid samples were collected with a Leutert positive displacement sampler (PDS) from 500 m to 2480 m depth in the open bore hole. The PDS allows sampling at in situ pressures, thus minimising fractionation from degassing during sampling. At the surface, the samples were transferred into an evacuated sampling line connected with a Cu-tube and a glass bulb for gas sampling, a pressure gauge, and a thermometer. Gas was liberated with a heated ultrasonic bath and then admitted to the sampling devices. Gas/water ratios were already determined in the field during gas extraction. Saline groundwaters rich in methane, nitrogen, hydrogen and helium and with water stable isotope composition distinctive from meteoric and sea water have been found to host isolated ecosystems within the Precambrian crystalline bedrock of Outokumpu (Kietäväinen et al., 2013). In order to characterise the geochemical and microbiological evolution of the deep subsurface of the area, noble gas residence times have been calculated based on radiogenic (4He, 40Ar), nucleogenic (21Ne) and fissiogenic (134Xe, 136Xe) noble gas nuclides. Geochemical and microbiological variations together with hydrogeological and geophysical data indicate negligible vertical fluid flow in the bedrock. Moreover, noble gas diffusion models show that diffusion is not likely to affect noble gas concentrations of groundwater at or below 500 m depth in Outokumpu. Therefore in situ accumulation was assumed as a basis for the age determination. In general, residence times between 10 and 50 Ma were indicated by 4He and21Ne, while somewhat younger ages were obtained by 40Ar, using average values for porosity, density and concentration of radioactive elements in the bedrock of Outokumpu. Kietäväinen R., Ahonen L., Kukkonen I.T., Hendriksson N., Nyyssönen M. and Itävaara M. (2013), Appl. Geochem. 32, 37-51.

  11. Geothermal drilling research in the United States

    SciTech Connect

    Varnado, S.G.

    1980-01-01

    Current research and development in the following areas are presented: geothermal roller cone bits, polycrystalline diamond compact bits, a continuous chain drill, drilling fluids test equipment, mud research, inert fluids, foam fluids, lost circulation control, completion technology, and advanced drilling and completion systems. (MHR)

  12. Advanced Drilling through Diagnostics-White-Drilling

    SciTech Connect

    FINGER,JOHN T.; GLOWKA,DAVID ANTHONY; LIVESAY,BILLY JOE; MANSURE,ARTHUR J.; PRAIRIE,MICHAEL R.

    1999-10-07

    A high-speed data link that would provide dramatically faster communication from downhole instruments to the surface and back again has the potential to revolutionize deep drilling for geothermal resources through Diagnostics-While-Drilling (DWD). Many aspects of the drilling process would significantly improve if downhole and surface data were acquired and processed in real-time at the surface, and used to guide the drilling operation. Such a closed-loop, driller-in-the-loop DWD system, would complete the loop between information and control, and greatly improve the performance of drilling systems. The main focus of this program is to demonstrate the value of real-time data for improving drilling. While high-rate transfer of down-hole data to the surface has been accomplished before, insufficient emphasis has been placed on utilization of the data to tune the drilling process to demonstrate the true merit of the concept. Consequently, there has been a lack of incentive on the part of industry to develop a simple, low-cost, effective high-speed data link. Demonstration of the benefits of DWD based on a high-speed data link will convince the drilling industry and stimulate the flow of private resources into the development of an economical high-speed data link for geothermal drilling applications. Such a downhole communication system would then make possible the development of surface data acquisition and expert systems that would greatly enhance drilling operations. Further, it would foster the development of downhole equipment that could be controlled from the surface to improve hole trajectory and drilling performance. Real-time data that would benefit drilling performance include: bit accelerations for use in controlling bit bounce and improving rock penetration rates and bit life; downhole fluid pressures for use in the management of drilling hydraulics and improved diagnosis of lost circulation and gas kicks; hole trajectory for use in reducing directional drilling costs; and downhole weight-on-bit and drilling torque for diagnosing drill bit performance. In general, any measurement that could shed light on the downhole environment would give us a better understanding of the drilling process and reduce drilling costs.

  13. Epidote-Bearing Veins in the State 2-14 Drill Hole: Implications for Hydrothermal Fluid Composition

    NASA Astrophysics Data System (ADS)

    Caruso, L. J.; Bird, D. K.; Cho, M.; Liou, J. G.

    1988-11-01

    Epidote-bearing veins in State 2-14 drill core from 900 to 2960 m depth were examined using backscattered electron microscopy and electron probe microanalysis to characterize the mineralogy, parageneses, texture, and composition of vein minerals. In order of decreasing abundance, minerals in epidote-bearing veins are pyrite, calcite, K-feldspar, quartz, anhydrite, hematite, chlorite, Fe-Cu-Zn sulfides, actinolite, titanite, and allanite. The downhole distribution of minerals in epidote-bearing veins (+ pyrite and quartz) varies as a function of depth and includes: (1) calcite above ˜2000 m, (2) K-feldspar between 1700 and 2745 m, (3) anhydrite between 2195 and 2745 m, (4) hematite ± sulfides above 2773 m, and (5) actinolite below ˜2890 m. Where present, K-feldspar was the first mineral to precipitate in veins followed by epidote. In all other veins, epidote was the earliest vein mineral to form. Calcite, quartz, anhydrite, hematite, and sulfides were paragenetically later. Compositional zoning, common in most vein epidotes, is typically symmetric with Al-rich cores and Fe3+ -rich rims. The minimum mole fraction of Ca2Fe3Si3O12(OH) (XPs) in vein epidotes decreases systematically with increasing depth from ˜0.33 at 906 m to ˜0.21 at 2900 m, and the maximum XPs at any given depth is greater than 0.33. Thermodynamic analyses of phase relations among vein-filling minerals and aqueous solutions at depths near 1867 m and 300°C indicate that the modern reservoir fluid in the Salton Sea geothermal system is in equilibrium with calcite + hematite + quartz + epidote (XPs = 0.33) ± anhydrite. The predicted fugacity of CO2 (˜14 bars) for the modern Salton Sea brine is in close agreement with the calculated value of fCO2 for the 1867 m production fluid. Theoretical phase diagrams in the system CaO-K2O-Fe2O3-Al2O3-SiO2-H2O-O2-S2-CO2 demonstrate that the mineralogies and mineral parageneses recorded hi epidote-bearing veins and the observed variations in Al-Fe3+ content of vein epidotes may result from only minor changes in the fugacity of CO2, O2, and S2 of the geothermal fluid.

  14. Apparatus for washing drill cuttings

    SciTech Connect

    Lott, W. G.

    1985-10-15

    An apparatus for cleansing a stream of drilling fluid fouled drill cuttings having a housing divided into a plurality of compartments each designed to retain cleansing fluid. A spinning force is imparted into the incoming fouled drill cuttings in an inlet chamber wherein cleansing fluid is intimately mixed with the fouled drill cuttings. A decanting chamber removes liberated drilling fluid from the cuttings and disposes of such drilling fluid from the apparatus via a drain trough assembly. The underflow from the decanter is passed through a solids concentrating assembly wherein the coarse solids are deposited in a concentrating assembly bottoms chamber wherein the settled drill cuttings are removed from the apparatus. The overhead stream from the solids concentrating assembly is driected to a second decanter for removal of any remaining drilling fluid and fine drill cuttings entrained therein from the apparatus via the drain trough assembly. The remaining fluid in the concentrating assembly bottoms chamber is recirculated to the second decanting chamber and the inlet chamber.

  15. Transient fluid flow through the toe of the Barbados Accretionary Complex: Constraints from ocean Drilling Program Leg 110 heat row studies and simple models

    NASA Astrophysics Data System (ADS)

    Fisher, A. T.; Hounslow, M. W.

    1990-06-01

    Thirty-four sediment and mud line temperatures were collected from six drill holes on Ocean Drilling Program (ODP) leg 110 near the toe of the Barbados accretionary complex. When combined with thermal conductivity measurements from sediment cores and results from earlier surveys, these data delineate the complicated thermal structure on the edge of this convergent margin. Heat flow values at the seafloor of 92-192 mW m-2 are 80-300% higher than those predicted by standard heat flow versus age models for oceanic crust but are compatible with earlier seafloor measurements made in this area at the same latitude. Heat flow tends to decrease downhole at four sites, suggesting the presence of heat sources within the sediments. These results are consistent with the flow of warm fluids through the complex along high permeability conduits, including thrust faults, the major décollement zone, and sandy intervals. Simple calculations suggest that this fluid flow is transient, occurring on time scales of tens to tens of thousands of years. Fluid flow velocities along the décollement zone, estimated with a simple thermal model, are about 10-7 m s-1, 100 times faster than predicted by numerical, steady state analyses. The estimated maximum sediment permeability within the décollement zone, which was based on the above fluid flow velocity, is about 10-12 m2, also 100 times higher than that calculated numerically. High heat flow in the vicinity of 15°20'N and not elsewhere along the deformation front suggests that the leg 110 drill sites may be situated over a prism-water discharge zone, with dewatering more active here than elsewhere along the accretionary complex.

  16. Chemical and Physical Characteristics of Basaltic Formation Fluids on a Ridge Flank: Using Drilling Perturbations to Elucidate Water-Rock-Microbial Reactions

    NASA Astrophysics Data System (ADS)

    Jannasch, H. W.; Wheat, G. C.; Hulme, S.; Becker, K.; Fisher, A. T.; Davis, E. E.

    2008-12-01

    Holes 1301A and 1301B were drilled, cased, and instrumented with long-term, subseafloor observatories (CORKs) on the eastern flank of the Juan de Fuca Ridge in Summer 2004. These holes penetrate 265 m of sediment and the uppermost 108 to 318 m of 3.5 Ma basaltic basement, in an area of vigorous, warm (64C) hydrothermal circulation. The new boreholes were located 1 km south and 2.4 km southwest of instrumented Holes 1026B and 1027C, respectively, that were emplaced eight years earlier. This network of four instrumented boreholes was established as part of a long-term, cross-hole experiment that will elucidate hydrologic properties and the nature and dynamics of microbial ecosystems within the upper oceanic crust, in a well defined geochemical and physical context. Downhole instrumented OsmoSampler packages in Holes 1301A and 1026B were replaced by submersible in summer 2008, as part of a program of observatory servicing in preparation for the next drilling expedition and the initiation of cross-hole experiments in this area. The borehole instrument package from Hole 1301A sampled borehole fluids within the upper 107.5 m of basaltic crust during a four-year period of drilling disturbance, self-sustaining flow of cold bottom water into basement, and subsequent recovery to near-predrilling chemical and thermal conditions. Because the borehole was incompletely sealed at the time of initial installation, bottom seawater flowed down into the borehole during the first three years following emplacement, driven by the higher density of cold bottom water relative to warm formation fluid. Borehole thermal records during the first 1.5 years show that temperatures in basement were below 10 C, and fluid samples from the borehole have a chemical composition similar to bottom seawater. Temperatures fluctuated for the next 1.5 years between 10 and 30 C, and the fluid composition began to shift towards that seen in regional basement fluids sampled at nearby Baby Bare outcrop and from Hole 1026B. In early September 2007 the natural formation overpressure overcame the excess pressure of cold bottom water and began to vent a mixture of recently-recharged bottom water and warm formation fluid. The present day composition of fluid venting from Hole 1301A is very similar to that sampled from Baby Bare outcrop. The progression from bottom seawater to formation fluid chemistry is not conservative relative to temperature, most likely because of water-rock and microbial reactions within basaltic basement.

  17. Electrical measuring while drilling with composite electrodes

    Microsoft Academic Search

    Peppers

    1986-01-01

    A method is described for transmitting data taken at the bottom of a well bore near the drill bit to the earth's surface through a large volume of the earth formation surrounding the well bore between the drill bit and the earth's surface. The method consists of: (a) generating electrical power within the drill pipe responsive to drilling fluids pumped

  18. Geothermal drill pipe corrosion test plan

    SciTech Connect

    Caskey, B.C.; Copass, K.S.

    1980-12-01

    Plans are presented for conducting a field test of drill pipe corrosion, comparing air and nitrogen as drilling fluids. This test will provide data for evaluating the potential of reducing geothermal well drilling costs by extending drill pipe life and reducing corrosion control costs. The 10-day test will take place during fall 1980 at the Baca Location in Sandoval County, New Mexico.

  19. Fluid inclusion from drill hole DW-5, Hohi geothermal area, Japan: Evidence of boiling and procedure for estimating CO2 content

    USGS Publications Warehouse

    Sasada, M.; Roedder, E.; Belkin, H.E.

    1986-01-01

    Fluid inclusion studies have been used to derive a model for fluid evolution in the Hohi geothermal area, Japan. Six types of fluid inclusions are found in quartz obtained from the drill core of DW-5 hole. They are: (I) primary liquid-rich with evidence of boiling; (II) primary liquid-rich without evidence of boiling; (III) primary vapor-rich (assumed to have been formed by boiling); (IV) secondary liquid-rich with evidence of boiling; (V) secondary liquid-rich without evidence of boiling; (VI) secondary vapor-rich (assumed to have been formed by boiling). Homogenization temperatures (Th) range between 196 and 347??C and the final melting point of ice (Tm) between -0.2 and -4.3??C. The CO2 content was estimated semiquantitatively to be between 0 and 0.39 wt. % based on the bubble behavior on crushing. NaCl equivalent solid solute salinity of fluid inclusions was determined as being between 0 and 6.8 wt. % after minor correction for CO2 content. Fluid inclusions in quartz provide a record of geothermal activity of early boiling and later cooling. The CO2 contents and homogenization temperatures of fluid inclusions with evidence of boiling generally increase with depth; these changes, and NaCl equivalent solid solute salinity of the fluid can be explained by an adiabatic boiling model for a CO2-bearing low-salinity fluid. Some high-salinity inclusions without CO2 are presumed to have formed by a local boiling process due to a temperature increase or a pressure decrease. The liquid-rich primary and secondary inclusions without evidence of boiling formed during the cooling process. The salinity and CO2 content of these inclusions are lower than those in the boiling fluid at the early stage, probably as a result of admixture with groundwater. ?? 1986.

  20. Intrinsic and scattering attenuation as derived from fluid induced microseismicity at the German Continental Deep Drilling site

    NASA Astrophysics Data System (ADS)

    Fielitz, D.; Wegler, U.

    2015-06-01

    Hydraulically induced microseismicity is used to study high-frequency attenuation properties (6-72 Hz) in an enhanced geothermal system. Intrinsic and scattering attenuation are separated by jointly inverting seismogram envelopes for structural parameters, source and site effects. Modelling of synthetic envelopes is based on radiative transfer theory. To speed up inversion, an analytical solution of the radiative transfer equation for a 3-D isotropic scattering medium is implemented. In order to compensate for the actual anisotropic scattering, a smoothing algorithm is applied to introduce envelope broadening and peak delay. The approach is tested with seismic data from four fluid-induced earthquakes (Mw ? 1) recorded by a temporary seismic network at the German Continental Deep Drilling (KTB) site at epicentral distances of less than 20 km. Full S-wave envelopes are inverted in 12 overlapping frequency bands with centre frequencies between 1.5 and 72 Hz. With data sampling at 200 Hz and high-frequency S-wave sources, attenuation estimates are obtained for the rarely probed frequency range between 30 and 70 Hz. From the inversion, we infer average values of the transport scattering coefficient g*, and the intrinsic absorption parameter b, as well as corresponding quality factors Qs and Qi. By comparison with attenuation estimates from regions with different tectonic activities, we see that both Qs and Qi for the investigated geothermal region fit best to moderate scattering and intrinsic regimes as obtained in tectonically active regions. A comparison with a regional attenuation model for southern Germany proves that attenuation estimates are scale-dependent. To compare intrinsic and scattering attenuation in the KTB region the transport mean free path (TMFP) and the absorption length (la) are calculated. For both, we find a clear frequency dependence proportional to f -0.8 (TMFP) and f -0.3 (la). TMFP decreases from 340 km at 6 Hz to 60 km at 72 Hz, whereas absorption length drops from 40 to 20 km, respectively. Thus, intrinsic absorption dominates over scattering attenuation by at least one order of magnitude. The influence of scattering becomes more significant towards higher frequencies. Moreover, comparing the apparent attenuation (inverse sum of TMFP and la) to values estimated with the spectral ratio technique, achieves a good agreement with mean deviations in the order of 3-5 per cent. From the frequency dependence of TMFP, it can be inferred that a von Karman-type of random medium with a Hurst exponent of ? = 0.11 is a good model for representing the stimulated reservoir at the KTB. The fractal distribution of scatterers agrees well with results derived from independent analysis of acoustic logs.

  1. Systems, apparatus and methods for measuring while drilling

    Microsoft Academic Search

    Scherbatskoy

    1982-01-01

    A method and apparatus are disclosed for continuously logging while drilling a well bore with a rotary drilling rig comprising a drill string, a jet type drill bit, and mud pump means for circulating fluid under pressure. The apparatus generally includes means for sensing one or more downhole parameters near the drill bit, means for generating a sequence of electrical

  2. Flow and thixotropy of non-contaminating oil drilling fluids formulated with bentonite and sodium carboxymethyl cellulose

    Microsoft Academic Search

    M. Dolz; J. Jiménez; M. Jesús Hernández; J. Delegido; A. Casanovas

    2007-01-01

    A study has been made of low-contaminating oil drilling mud in water base, composed of bentonite, at concentrations in the range of 6–12% (w\\/w), and sodium carboxymethyl cellulose at two different concentrations. Flow analysis yielded an empirical formula indicating shear stress as a function of the formulation concentrations of bentonite and sodium carboxymethyl cellulose, stirring time and shear rate. To

  3. CENSUS AND STATISTICAL CHARACTERIZATION OF SOIL AND WATER QUALITY AT ABANDONED AND OTHER CENTRALIZED AND COMMERCIAL DRILLING-FLUID DISPOSAL SITES IN LOUISIANA, NEW MEXICO, OKLAHOMA, AND TEXAS

    SciTech Connect

    Alan R. Dutton; H. Seay Nance

    2003-06-01

    Commercial and centralized drilling-fluid disposal (CCDD) sites receive a portion of spent drilling fluids for disposal from oil and gas exploration and production (E&P) operations. Many older and some abandoned sites may have operated under less stringent regulations than are currently enforced. This study provides a census, compilation, and summary of information on active, inactive, and abandoned CCDD sites in Louisiana, New Mexico, Oklahoma, and Texas, intended as a basis for supporting State-funded assessment and remediation of abandoned sites. Closure of abandoned CCDD sites is within the jurisdiction of State regulatory agencies. Sources of data used in this study on abandoned CCDD sites mainly are permit files at State regulatory agencies. Active and inactive sites were included because data on abandoned sites are sparse. Onsite reserve pits at individual wells for disposal of spent drilling fluid are not part of this study. Of 287 CCDD sites in the four States for which we compiled data, 34 had been abandoned whereas 54 were active and 199 were inactive as of January 2002. Most were disposal-pit facilities; five percent were land treatment facilities. A typical disposal-pit facility has fewer than 3 disposal pits or cells, which have a median size of approximately 2 acres each. Data from well-documented sites may be used to predict some conditions at abandoned sites; older abandoned sites might have outlier concentrations for some metal and organic constituents. Groundwater at a significant number of sites had an average chloride concentration that exceeded nonactionable secondary drinking water standard of 250 mg/L, or a total dissolved solids content of >10,000 mg/L, the limiting definition for underground sources of drinking water source, or both. Background data were lacking, however, so we did not determine whether these concentrations in groundwater reflected site operations. Site remediation has not been found necessary to date for most abandoned CCDD sites; site assessments and remedial feasibility studies are ongoing in each State. Remediation alternatives addressed physical hazards and potential for groundwater transport of dissolved salt and petroleum hydrocarbons that might be leached from wastes. Remediation options included excavation of wastes and contaminated adjacent soils followed by removal to permitted disposal facilities or land farming if sufficient on-site area were available.

  4. HYDRATE CORE DRILLING TESTS

    SciTech Connect

    John H. Cohen; Thomas E. Williams; Ali G. Kadaster; Bill V. Liddell

    2002-11-01

    The ''Methane Hydrate Production from Alaskan Permafrost'' project is a three-year endeavor being conducted by Maurer Technology Inc. (MTI), Noble, and Anadarko Petroleum, in partnership with the U.S. DOE National Energy Technology Laboratory (NETL). The project's goal is to build on previous and ongoing R&D in the area of onshore hydrate deposition. The project team plans to design and implement a program to safely and economically drill, core and produce gas from arctic hydrates. The current work scope includes drilling and coring one well on Anadarko leases in FY 2003 during the winter drilling season. A specially built on-site core analysis laboratory will be used to determine some of the physical characteristics of the hydrates and surrounding rock. Prior to going to the field, the project team designed and conducted a controlled series of coring tests for simulating coring of hydrate formations. A variety of equipment and procedures were tested and modified to develop a practical solution for this special application. This Topical Report summarizes these coring tests. A special facility was designed and installed at MTI's Drilling Research Center (DRC) in Houston and used to conduct coring tests. Equipment and procedures were tested by cutting cores from frozen mixtures of sand and water supported by casing and designed to simulate hydrate formations. Tests were conducted with chilled drilling fluids. Tests showed that frozen core can be washed out and reduced in size by the action of the drilling fluid. Washing of the core by the drilling fluid caused a reduction in core diameter, making core recovery very difficult (if not impossible). One successful solution was to drill the last 6 inches of core dry (without fluid circulation). These tests demonstrated that it will be difficult to capture core when drilling in permafrost or hydrates without implementing certain safeguards. Among the coring tests was a simulated hydrate formation comprised of coarse, large-grain sand in ice. Results with this core showed that the viscosity of the drilling fluid must also be carefully controlled. When coarse sand was being cored, the core barrel became stuck because the drilling fluid was not viscous enough to completely remove the large grains of sand. These tests were very valuable to the project by showing the difficulties in coring permafrost or hydrates in a laboratory environment (as opposed to a field environment where drilling costs are much higher and the potential loss of equipment greater). Among the conclusions reached from these simulated hydrate coring tests are the following: Frozen hydrate core samples can be recovered successfully; A spring-finger core catcher works best for catching hydrate cores; Drilling fluid can erode the core and reduces its diameter, making it more difficult to capture the core; Mud must be designed with proper viscosity to lift larger cuttings; and The bottom 6 inches of core may need to be drilled dry to capture the core successfully.

  5. Quaternary enhancement of westerly jet and central Asian aridification: carbonate and salt fluid inclusion isotope records from deep drilling in the Qaidam salt playa, NE Tibet

    NASA Astrophysics Data System (ADS)

    Xi, X.; Han, W.; Fang, X.

    2014-12-01

    The vast Asian arid inland under the westerlies exerts great impacts on global climatic change. However, its evolution history and its relation with the westerlies, Tibet uplift and global change are still unknown. Here we present high quality carbonate and salt fluid inclusion isotope records from a near thousand meter deep drilling core in the Qaidam salt playa, NW China. They reveal an evident long-term persistent aridification of Asian inland since ca. 1.2 Ma, followed by an accelerated drying since ca. 0.6 Ma. We propose that the rapid uplift of the Tibetan Plateau in the mid-Pleistocene (called Yellow River Movement) might have contributed to the desiccation of the Asian inland through enhancing and bending the westerly jet and its associated ascending flow and blocking the moisture input from the westerlies and monsoons.

  6. The effect of various mixers on the viscosity and flow properties of an oil well drilling fluid

    E-print Network

    Spannagel, Johnny Allen

    1957-01-01

    . The Effect of Adding Water to Reduce the Density of Its Original Value 27 IV. The Effect of Aging on a B entonite Mud. 2B ABSTRACT This thesis presents a comparison of some of the common labora- tory mixers for use in agitating drilling muds to a mixer... designed as a part of this research to overcome evaporation of the water phase of the mud. The latter is termed the Lo-Speed mixer. The mud was agitated at speeds of 400, 610, and 1, 500 rpm in the Lo-Speed mixer, 15, 000 rpm in the Waring Blendor...

  7. OCEAN DRILLING PROGRAM LEG 205 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 205 SCIENTIFIC PROSPECTUS FLUID FLOW AND SUBDUCTION FLUXES ACROSS __________________ Dr. Jack Baldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University Manager and Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College

  8. Nonlinear model predictive control scheme for stabilizing annulus pressure during oil well drilling

    Microsoft Academic Search

    Gerhard Nygaard; Geir Nævdal

    2006-01-01

    This paper presents a nonlinear model predictive control scheme for stabilizing the well pressure during oil well drilling. While drilling, a fluid is pumped through the drill string and the drill bit, and is returning through the annulus between the drilled well and the drill string. Varying reservoir conditions and fluctuation in circulation flow rates cause sudden variations in the

  9. Transducer for downhole drilling components

    DOEpatents

    Hall, David R; Fox, Joe R

    2006-05-30

    A robust transmission element for transmitting information between downhole tools, such as sections of drill pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The transmission element maintains reliable connectivity between transmission elements, thereby providing an uninterrupted flow of information between drill string components. A transmission element is mounted within a recess proximate a mating surface of a downhole drilling component, such as a section of drill pipe. The transmission element may include an annular housing forming a trough, an electrical conductor disposed within the trough, and an MCEI material disposed between the annular housing and the electrical conductor.

  10. Measurement-while-drilling (MWD) development for air drilling

    SciTech Connect

    Rubin, L.A.; Harrison, W.H.

    1992-01-01

    The objective of this program is to tool-harden and make commercially available an existing wireless MWD tool to reliably operate in an air, air-mist, or air-foam environment during Appalachian Basin oil and gas directional drilling operations in conjunction with downhole motors and/or (other) bottom-hole assemblies. The application of this technology is required for drilling high angle (holes) and horizontal well drilling in low-pressure, water sensitive, tight gas formations that require air, air-mist, and foam drilling fluids. The basic approach to accomplishing this objective was to modify GEC's existing electromagnetic (e-m) CABLELESS''{trademark} MWD tool to improve its reliability in air drilling by increasing its tolerance to higher vibration and shock levels (hardening). Another important aim of the program is to provide for continuing availability of the resultant tool for use on DOE-sponsored, and other, air-drilling programs.

  11. Measurement-while-drilling (MWD) development for air drilling

    SciTech Connect

    Rubin, L.A.; Harrison, W.H.

    1992-06-01

    The objective of this program is to tool-harden and make commercially available an existing wireless MWD tool to reliably operate in an air, air-mist, or air-foam environment during Appalachian Basin oil and gas directional drilling operations in conjunction with downhole motors and/or (other) bottom-hole assemblies. The application of this technology is required for drilling high angle (holes) and horizontal well drilling in low-pressure, water sensitive, tight gas formations that require air, air-mist, and foam drilling fluids. The basic approach to accomplishing this objective was to modify GEC`s existing electromagnetic (e-m) ``CABLELESS``{trademark} MWD tool to improve its reliability in air drilling by increasing its tolerance to higher vibration and shock levels (hardening). Another important aim of the program is to provide for continuing availability of the resultant tool for use on DOE-sponsored, and other, air-drilling programs.

  12. Geothermal well drilling manual at Cerro Prieto

    SciTech Connect

    Fernandez P., A.; Flores S., M.

    1982-08-10

    The objective of the drilling manual is to solve all problems directly related to drilling during the construction of a well. In this case, the topics dealt which are drilling fluids and hydraulics to be applied in the field to improve drilling progress, eliminate risks and achieve good well-completion. There are other topics that are applicable such as drill bits and the drilling string, which are closely linked to drilling progress. On this occasion drilling fluid and hydraulics programs are presented, in addition to a computing program for a Casio FX-502P calculator to be applied in the field to optimize hydraulics and in the analysis of hydraulics for development and exploration wells at their different intervals.

  13. NETL Extreme Drilling Laboratory Studies High Pressure High Temperature Drilling Phenomena

    SciTech Connect

    Lyons, K.D.; Honeygan, S.; Moroz, T.H.

    2008-12-01

    The U.S. Department of Energy's National Energy Technology Laboratory (NETL) established the Extreme Drilling Laboratory to engineer effective and efficient drilling technologies viable at depths greater than 20,000 ft. This paper details the challenges of ultradeep drilling, documents reports of decreased drilling rates as a result of increasing fluid pressure and temperature, and describes NETL's research and development activities. NETL is invested in laboratory-scale physical simulation. Its physical simulator will have capability of circulating drilling fluids at 30,000 psi and 480°F around a single drill cutter. This simulator is not yet operational; therefore, the results will be limited to the identification of leading hypotheses of drilling phenomena and NETL's test plans to validate or refute such theories. Of particular interest to the Extreme Drilling Laboratory's studies are the combinatorial effects of drilling fluid pressure, drilling fluid properties, rock properties, pore pressure, and drilling parameters, such as cutter rotational speed, weight on bit, and hydraulics associated with drilling fluid introduction to the rock-cutter interface. A detailed discussion of how each variable is controlled in a laboratory setting will be part of the conference paper and presentation.

  14. NETL Extreme Drilling Laboratory Studies High Pressure High Temperature Drilling Phenomena

    SciTech Connect

    Lyons, K.D.; Honeygan, S.; Moroz, T

    2007-06-01

    The U.S. Department of Energy’s National Energy Technology Laboratory (NETL) established an Extreme Drilling Lab to engineer effective and efficient drilling technologies viable at depths greater than 20,000 feet. This paper details the challenges of ultra-deep drilling, documents reports of decreased drilling rates as a result of increasing fluid pressure and temperature, and describes NETL’s Research and Development activities. NETL is invested in laboratory-scale physical simulation. Their physical simulator will have capability of circulating drilling fluids at 30,000 psi and 480 °F around a single drill cutter. This simulator will not yet be operational by the planned conference dates; therefore, the results will be limited to identification of leading hypotheses of drilling phenomena and NETL’s test plans to validate or refute such theories. Of particular interest to the Extreme Drilling Lab’s studies are the combinatorial effects of drilling fluid pressure, drilling fluid properties, rock properties, pore pressure, and drilling parameters, such as cutter rotational speed, weight on bit, and hydraulics associated with drilling fluid introduction to the rock-cutter interface. A detailed discussion of how each variable is controlled in a laboratory setting will be part of the conference paper and presentation.

  15. DRILLING MUD ASSESSMENT CHEMICAL ANALYSIS REFERENCE VOLUME

    EPA Science Inventory

    This report presents concentrations of specific metals and hydrocarbons in eleven drilling fluids (muds) taken from operating gas and oil rigs in the Gulf of Mexico. Each drilling fluid was analyzed chemically for heavy metal and hydrocarbon content in three distinct phases: (1) ...

  16. Drilling mud proposal

    SciTech Connect

    Steed, W.

    1981-12-01

    A discussion of the disposal of drilling fluids from Texas oil fields was presented. The most common is the transport of the drilling mud to approved landfills. This requires that the waste be fresh waste base mud only, contained in the pit, and be maintained oil free. Other approved methods of disposal include treatment with discharge of effluent to surface streams, land application on farm land (with owner's permission), and subsurface disposal. Some common illegal disposal methods included dumping on roadsides or private property (without owner's permission).

  17. A successful borehole drilled by cryogenic drilling in an arid, unconsolidated soil with boulders

    SciTech Connect

    Cavagnaro, P.; Simon, R.D.; Cooper, G.A. [Univ. of California, Berkeley, CA (United States). Dept. of Materials Science and Mineral Engineering

    1997-07-01

    An 80 foot deep borehole was drilled using a novel cryogenic drilling method. The freeze while drilling technique stabilizes the borehole wall while drilling by using conventional air rotary methods but with low temperature nitrogen gas (as cold as {minus}196 C) as the drilling fluid. The location of the field test was a semi-arid alluvial unconsolidated sedimentary formation at the Aerojet, Inc. site in Rancho Cordova, California. The geology was a sandy soil matrix containing cobbles and boulders. The test goal was to drill to 100 feet (30 m), but the test was terminated at 80 feet due to a failure of the swivel shaft and drill bit resulting from the very rough drilling conditions. No safety, technical, or operational problems were encountered that could prevent cryogenic drilling from becoming a standard technique for drilling in unstable near-surface formations.

  18. Review of Downhole Measurement-While-Drilling Systems

    Microsoft Academic Search

    Wilton Gravley

    1983-01-01

    Several downhole measurement-while-drilling (MWD) systems are currently being developed and some are already in use on a commercial basis. These devices all have sensors located immediately above, or near, the drill bit to monitor drilling variables and, in some cases, formation properties. Information is collected downhole, and sent (telemetered) to the surface through either the drilling fluid, electrical conductors, the

  19. Improved Efficiency of Oil Well Drilling through Case Based Reasoning

    E-print Network

    Aamodt, Agnar

    1 Improved Efficiency of Oil Well Drilling through Case Based Reasoning Paal Skalle Norwegian drilling, has been developed in cooperation with an oil company. From several reoccurring problems during oil well drilling the problem of "lost circulation", i.e. loss of circulating drilling fluid

  20. The propagation of sound waves in drill strings

    Microsoft Academic Search

    Douglas S. Drumheller; S. D. Knudsen

    1995-01-01

    Deep wells are commonly drilled while steering the drill bit. The steering process is completely controlled by the drilling-rig operator. A key element of this procedure is the measurement and communication of navigation information from the bottom of the well to the operator. Pressure pulses modulated onto the flow of the drill fluid are now employed in some cases to

  1. Lockdown Drills

    ERIC Educational Resources Information Center

    North Dakota Department of Public Instruction, 2011

    2011-01-01

    As a result of House Bill 1215, introduced and passed during the 2011 North Dakota legislative session, every school building in North Dakota must conduct a lockdown drill. While no timeframe, tracking or penalty was identified in the state law, the North Dakota Department of Public Instruction (DPI) advocates annual drills, at a minimum, which…

  2. Disaster Drill.

    ERIC Educational Resources Information Center

    Jones, Rebecca

    1998-01-01

    Bus disaster drills have been held all over country for years. A drill in Blairsville, Pennsylvania, taught officials important lessons: (1) keep roster of students and stops in designated area on bus, and ensure emergency workers know where location; (2) send at least three school officials to accident scene; (3) provide school officials with…

  3. Constraints on mineralization, fluid-rock interaction, and mass transfer during faulting at 2-3 km depth from the SAFOD drill hole

    NASA Astrophysics Data System (ADS)

    Schleicher, Anja M.; Tourscher, Sara N.; van der Pluijm, Ben A.; Warr, Laurence N.

    2009-04-01

    Mineralogical and geochemical changes in mudrock cuttings from two segments of the San Andreas Fault Observatory at Depth (SAFOD) drill hole (3066-3169 and 3292-3368 m measured depth) are analyzed in this study. Bulk rock samples and hand-picked fault-related grains characterized by polished surfaces and slickensides were investigated by X-ray diffraction, electron microscopy, and geochemical analysis. The elemental changes in fault-related grains along the sampled San Andreas Fault are attributed to dissolution of detrital grains (particularly feldspar and quartz) and local precipitation of illite-smectite and/or chlorite-smectite mixed layers in fractures and veins. Assuming ZrO2 and TiO2 to be immobile elements, systematic differences in element concentrations show that most of the elements are depleted in the fault-related grains compared to the wall rock lithology. Calculated mass loss between the bulk rock and picked fault rock ranges from 17 to 58% with a greater mass transport in the shallow trace of the sampled fault that marks the upper limit the fault core. The relatively large amount of element transport at temperatures of ˜110-114°C recorded throughout the core requires extensive fluid circulation during faulting. Whereas dissolution/precipitation may be partly induced by the disequilibrium between fluids and rocks during diagenetic processes, stress-induced dissolution at grain contacts is proposed as the main mechanism for extensive mineral transformation in the fault rocks and localization of neomineralization along grain interface slip surfaces.

  4. Comprehensive Ocean Drilling

    E-print Network

    Comprehensive Ocean Drilling Bibliography containing citations related to the Deep Sea Drilling Project, Ocean Drilling Program, Integrated Ocean Drilling Program, and International Ocean Discovery Program Last updated: May 2014 #12;Comprehensive Bibliography Comprehensive Ocean Drilling Bibliography

  5. Sulfide composition and microthermometry of fluid inclusions in the Leg 111 sheeted dike section of Ocean Drilling Program Hole 504B, Costa Rica Rift

    NASA Astrophysics Data System (ADS)

    SchöPs, Dietmar; Herzig, Peter M.

    1990-06-01

    Hole 504B of the Ocean Drilling Program is dedicated to the study of crustal structure and hydrothermal processes in 5.9-m.y.-old oceanic basement. Continuing the work of previous legs, hole 504B was extended 212.3 m to a total depth of 1562.3 m below seafloor (bsf) during leg 111 in 1986. Quartz-sulfide veins occur at a depth of 1369-1388 m bsf in basalts of the sheeted dike complex. The ore minerals are predominantly pyrite, less chalcopyrite, rare Corich Cu-Fe-S phases, and a thiospinel (linnaeite/carrollite). Microprobe analyses yield a high Co content in zoned vein pyrites (>8 wt %) as well as in the Cu-Fe-S phases (>5 wt %). Up to 35.8 wt % Co was detected in the thiospinel. A Co/Ni ratio of >100 distinguishes the vein pyrite from pyrite in the basaltic wall rock and from pyrite formed as an alteration product of olivine (Co/Ni <5). The Co/Ni ratios correlate positively with Cu and negatively with As. Co-rich, nonstoichiometric Cu-Fe-S sulfides in chalcopyrite are interpreted as metastable phases which have been quenched at a high temperature and prohibited from exsolution of the stable products chalcopyrite and pyrite. Fluid inclusions in quartz from the quartz-sulfide veins are two-phase and vary from liquid- to vapor-dominated. Their salinities range from 4.2 to 7.2 wt % equivalent NaCl and average 5.5 wt %. Pressure (360 bars) corrected average filling temperatures vary from 271° to 408°C with a maximum of 486°C. This is consistent with calculated quartz formation temperatures for a single quartz separate (+4.2‰ ?18O) using oxygen isotope thermometry. The ?18O value of the hydrothermal fluid was determined to be +1.7‰. The temperature data indicate fluid alteration of the sheeted dikes at about 350° to 500°C. The maximum homogenization temperatures intersect the liquid/vapor two-phase boundary above the critical point of seawater. Thus phase separation could have occurred before or during the formation of the mineralized veins and the alteration of the sheeted dike sequence.

  6. Drainhole drilling

    SciTech Connect

    Schuh, F. J.

    1985-05-28

    A method for drilling a well in the earth for the production of minerals therefrom wherein a primary wellbore is first drilled into the earth, the primary wellbore being a deviated wellbore having a radius of curvature in the range of from about 2.5 to about 6 degrees per 100 feet of primary wellbore length, and then drilling from said primary wellbore at least one drainhole wellbore, said drainhole wellbore having a radius of curvature in the range of from about 0.2 to about 3 degrees per 1 foot of drainhole wellbore length.

  7. Opon Gas Field, Colombia: Part II - drilling case history

    SciTech Connect

    Greener, J.M.; Trimble, G.E.; Singer, G.M.; Barnes, M.J.

    1996-12-31

    This paper describes the Opon Gas Field development drilling case history in the Middle Magdalena Basin of north-central Colombia, South America. World class levels of drilling fluid and cementing densities in excess of 22.0 ppg were required to control the extreme pressures encountered. A continuous improvement process is detailed in regard to casing, drilling fluid, cement and related drilling mechanics programs in a severely pressured and environmentally sensitive operation.

  8. Gas Drill 

    E-print Network

    Unknown

    2011-09-05

    Formation damage has long been recognized as a potential source of reduced productivity and injectivity in both horizontal and vertical wells. From the moment that the pay zone is being drilled until the well is put on production, a formation...

  9. Drill Field 

    E-print Network

    Unknown

    2011-09-05

    Gas hydrate research in the last two decades has taken various directions ranging from ways to understand the safe and economical production of this enormous resource to drilling problems. as more rigs and production platforms move into deeper...

  10. Drilling systems for extraterrestrial subsurface exploration.

    PubMed

    Zacny, K; Bar-Cohen, Y; Brennan, M; Briggs, G; Cooper, G; Davis, K; Dolgin, B; Glaser, D; Glass, B; Gorevan, S; Guerrero, J; McKay, C; Paulsen, G; Stanley, S; Stoker, C

    2008-06-01

    Drilling consists of 2 processes: breaking the formation with a bit and removing the drilled cuttings. In rotary drilling, rotational speed and weight on bit are used to control drilling, and the optimization of these parameters can markedly improve drilling performance. Although fluids are used for cuttings removal in terrestrial drilling, most planetary drilling systems conduct dry drilling with an auger. Chip removal via water-ice sublimation (when excavating water-ice-bound formations at pressure below the triple point of water) and pneumatic systems are also possible. Pneumatic systems use the gas or vaporization products of a high-density liquid brought from Earth, gas provided by an in situ compressor, or combustion products of a monopropellant. Drill bits can be divided into coring bits, which excavate an annular shaped hole, and full-faced bits. While cylindrical cores are generally superior as scientific samples, and coring drills have better performance characteristics, full-faced bits are simpler systems because the handling of a core requires a very complex robotic mechanism. The greatest constraints to extraterrestrial drilling are (1) the extreme environmental conditions, such as temperature, dust, and pressure; (2) the light-time communications delay, which necessitates highly autonomous systems; and (3) the mission and science constraints, such as mass and power budgets and the types of drilled samples needed for scientific analysis. A classification scheme based on drilling depth is proposed. Each of the 4 depth categories (surface drills, 1-meter class drills, 10-meter class drills, and deep drills) has distinct technological profiles and scientific ramifications. PMID:18598141

  11. Drilling Systems for Extraterrestrial Subsurface Exploration

    NASA Astrophysics Data System (ADS)

    Zacny, K.; Bar-Cohen, Y.; Brennan, M.; Briggs, G.; Cooper, G.; Davis, K.; Dolgin, B.; Glaser, D.; Glass, B.; Gorevan, S.; Guerrero, J.; McKay, C.; Paulsen, G.; Stanley, S.; Stoker, C.

    2008-06-01

    Drilling consists of 2 processes: breaking the formation with a bit and removing the drilled cuttings. In rotary drilling, rotational speed and weight on bit are used to control drilling, and the optimization of these parameters can markedly improve drilling performance. Although fluids are used for cuttings removal in terrestrial drilling, most planetary drilling systems conduct dry drilling with an auger. Chip removal via water-ice sublimation (when excavating water-ice bound formations at pressure below the triple point of water) and pneumatic systems are also possible. Pneumatic systems use the gas or vaporization products of a high-density liquid brought from Earth, gas provided by an in situ compressor, or combustion products of a monopropellant. Drill bits can be divided into coring bits, which excavate an annular shaped hole, and full-faced bits. While cylindrical cores are generally superior as scientific samples, and coring drills have better performance characteristics, full-faced bits are simpler systems because the handling of a core requires a very complex robotic mechanism. The greatest constraints to extraterrestrial drilling are (1) the extreme environmental conditions, such as temperature, dust, and pressure; (2) the light-time communications delay, which necessitates highly autonomous systems; and (3) the mission and science constraints, such as mass and power budgets and the types of drilled samples needed for scientific analysis. A classification scheme based on drilling depth is proposed. Each of the 4 depth categories (surface drills, 1-meter class drills, 10-meter class drills, and deep drills) has distinct technological profiles and scientific ramifications.

  12. The Iceland deep drilling project: Its global significance

    Microsoft Academic Search

    Wilfred A. Elders; Gudmundur O. Fridleifsson; Seiji Saito

    2003-01-01

    The Iceland Deep Drilling Project (IDDP) is a long-term program to improve the economics of geothermal energy by producing supercritical hydrous fluids from drillable depths. Supercritical fluids have higher enthalpy than steam produced from two- phase systems. Large changes in physical properties near the critical point can lead to extremely high flow rates. Studying supercritical fluids will require drilling wells

  13. OCEAN DRILLING PROGRAM LEG 190 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 190 SCIENTIFIC PROSPECTUS DEFORMATION AND FLUID FLOW PROCESSES Taira Co-Chief Scientist Ocean Research Institute University of Tokyo 1-15-1 Minamidai Nakano-ku Tokyo 164 Japan __________________ Dr. Jack Baldauf Deputy Director of Science Operations Ocean Drilling

  14. Multi-gradient drilling method and system

    DOEpatents

    Maurer, William C. (Houston, TX); Medley, Jr., George H. (Spring, TX); McDonald, William J. (Houston, TX)

    2003-01-01

    A multi-gradient system for drilling a well bore from a surface location into a seabed includes an injector for injecting buoyant substantially incompressible articles into a column of drilling fluid associated with the well bore. Preferably, the substantially incompressible articles comprises hollow substantially spherical bodies.

  15. Analysis of infill drilling

    SciTech Connect

    Gould, T.L.; Munoz, M.A.

    1982-01-01

    This study analyzes the effect of reservoir and fluid properties on infill performance and determines the conditions under which infilling is economically justified. Waterflood stimulations were performed on single- and multi-layer 5-spot symmetry elements. Infilling was performed at several water cuts in order to evaluate the effect of initial saturation distribution on oil rate decline characteristics. Infill decline characteristics and cut-cum analysis were compared with continuation of the existing waterflood to the economic limit. It has been shown that infill drilling performance is sensitive to water cut at infill, oil viscosity, heterogeneity, and the degree of cross-flow between layers. The results of this work can be used to estimate the amount of incremental secondary oil that will result from infill drilling an ongoing pattern waterflood. 13 references.

  16. Ice Drilling Gallonmilkjugs

    E-print Network

    Saffman, Mark

    Ice Drilling Materials · Gallonmilkjugs · Syringes,largeand small · Pitchers · Spraybottles · 13x9? ·Isitbettertosquirtthewaterslowlyorasquicklyaspossible? ·Doestherateatwhichyousquirtthewaterchangethediameteroftheholes? ·Doesthetypeof`drill

  17. Coiled tubing drilling with supercritical carbon dioxide

    DOEpatents

    Kolle , Jack J. (Seattle, WA)

    2002-01-01

    A method for increasing the efficiency of drilling operations by using a drilling fluid material that exists as supercritical fluid or a dense gas at temperature and pressure conditions existing at a drill site. The material can be used to reduce mechanical drilling forces, to remove cuttings, or to jet erode a substrate. In one embodiment, carbon dioxide (CO.sub.2) is used as the material for drilling within wells in the earth, where the normal temperature and pressure conditions cause CO.sub.2 to exist as a supercritical fluid. Supercritical carbon dioxide (SC--CO.sub.2) is preferably used with coiled tube (CT) drilling equipment. The very low viscosity SC--CO.sub.2 provides efficient cooling of the drill head, and efficient cuttings removal. Further, the diffusivity of SC--CO.sub.2 within the pores of petroleum formations is significantly higher than that of water, making jet erosion using SC--CO.sub.2 much more effective than water jet erosion. SC--CO.sub.2 jets can be used to assist mechanical drilling, for erosion drilling, or for scale removal. A choke manifold at the well head or mud cap drilling equipment can be used to control the pressure within the borehole, to ensure that the temperature and pressure conditions necessary for CO.sub.2 to exist as either a supercritical fluid or a dense gas occur at the drill site. Spent CO.sub.2 can be vented to the atmosphere, collected for reuse, or directed into the formation to aid in the recovery of petroleum.

  18. Evaluation of New Vegetable-Based Cutting Fluids on Thrust Force and Surface Roughness in Drilling of AISI 304 Using Taguchi Method

    Microsoft Academic Search

    E. Kuram; B. Ozcelik; E. Demirbas; E. ?ik; I. N. Tansel

    2011-01-01

    This study focused on both formulation of vegetable-based cutting fluids (VBCFs) and machining with these cutting fluids. For this purpose, characterizations of chemical and physical analyses of these formulated cutting fluids were carried out. Performances of five cutting fluids, three VBCFs developed from crude and refined sunflower oils, and two commercial types, were investigated for thrust force and surface roughness

  19. Evaluation of New Vegetable Based Cutting Fluids on Thrust Force and Surface Roughness in Drilling of AISI 304 Using Taguchi Method

    Microsoft Academic Search

    E. Kuram; B. Ozcelik; E. Demirbas; E. ?ik; I. N. Tansel

    2011-01-01

    This study focused on both formulation of vegetable based cutting fluids (VBCFs) and machining with these cutting fluids. For this purpose, characterizations of chemical and physical analyses of these formulated cutting fluids were carried out. Performances of five cutting fluids, three VBCFs developed from crude and refined sunflower oils, and two commercial types, were investigated for thrust force and surface

  20. Loaded Transducer Fpr Downhole Drilling Component

    DOEpatents

    Hall, David R. (Provo, UT); Hall, H. Tracy (Provo, UT); Pixton, David (Lehi, UT); Dahlgren, Scott (Provo, UT); Sneddon, Cameron (Provo, UT); Briscoe, Michael (Lehi, UT); Fox, Joe (Spanish Fork, UT)

    2005-07-05

    A robust transmission element for transmitting information between downhole tools, such as sections of drill pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The transmission element maintains reliable connectivity between transmission elements, thereby providing an uninterrupted flow of information between drill string components. A transmission element is mounted within a recess proximate a mating surface of a downhole drilling component, such as a section of drill pipe. To close gaps present between transmission elements, transmission elements may be biased with a "spring force," urging them closer together.

  1. Loaded transducer for downhole drilling components

    DOEpatents

    Hall, David R.; Hall, Jr., H. Tracy; Pixton, David S.; Briscoe, Michael A.; Dahlgren, Scott Steven; Fox, Joe; Sneddon, Cameron

    2006-02-21

    A robust transmission element for transmitting information between downhole tools, such as sections of drill pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The transmission element maintains reliable connectivity between transmission elements, thereby providing an uninterrupted flow of information between drill string components. A transmission element is mounted within a recess proximate a mating surface of a downhole drilling component, such as a section of drill pipe. To close gaps present between transmission elements, transmission elements may be biased with a "spring force, urging them closer together."

  2. Measuring skin while drilling

    SciTech Connect

    Engler, T.W.; Osisanya, S.; Tiab, D.

    1995-12-31

    A new model is proposed to characterize the variation in skin effect along a horizontal well. Typically, a cylindrical-shaped damaged region is assumed; however, this work describes the damaged region as a combination cylindrical-conical shape. The shape of the damaged region and the severity of the damage is governed by the contact time of the drilling fluid with the formation. This time is a function of the drilling rate penetration (ROP) and the mud filtrate invasion rate. Simple, empirical models are used to provide ROP and mud filtrate invasion rate. The effects of anisotropy ratio, penetration rates, and horizontal length are included in the analysis. Anisotropy and increasing penetration rate both will result in a decrease in the skin effect. Any horizontal well length greater than the equivalent horizontal length of the cone-shaped damage region will result in a constant cylindrical-shaped damage region, which can be evaluated using Hawkins` formula. The cone-shaped damage region will exist at the furthest end of the horizontal length. The time to transform the cone-shaped damage region to a cylinder is the circulation time after drilling to the total length. This circulation time is determined for the various anisotropy ratios and penetration rates.

  3. CHIP MORPHOLOGY AND HOLE SURFACE TEXTURE IN THE DRILLING OF CAST ALUMINUM ALLOYS. (R825370C057)

    EPA Science Inventory

    The effects of cutting fluid and other process variables on chip morphology when drilling cast aluminium alloys are investigated. The effects of workpiece material, speed, feed, hole depth, cutting-fluid presence and percentage oil concentration, workpiece temperature, drill t...

  4. Simulation of two phase flow of liquid - solid in the annular space in drilling operation

    NASA Astrophysics Data System (ADS)

    Kootiani, Reza Cheraghi; Samsuri, Ariffin Bin

    2014-10-01

    Drilling cutting transfer is an important factor in oil and gas wells drilling. So that success drilling operation is directly dependent on the quality of clean the wellbore drilling operation. In this paper, modeled upward flow of liquid - solid in the annular concentric and non-concentric in the well drilling by Euler two - fluid model and then analysis using numerical method. Numerical simulation of liquid - solid flow evaluated initially with a Newtonian fluid (water) and then a non-Newtonian fluid (CMC solution 0.4%). After that, investigated the effect of parameters such as flow rate, rotating drill pipe and out of centered on drilling operations. The results show that drilling cutting transfer is improve due to the rotation of drill pipe particularly in drilling operations.

  5. Quantification of subsurface pore pressure through IODP drilling

    Microsoft Academic Search

    D. M. Saffer; P. B. Flemings

    2010-01-01

    It is critical to understand the magnitude and distribution of subsurface pore fluid pressure: it controls effective stress and thus mechanical strength, slope stability, and sediment compaction. Elevated pore pressures also drive fluid flows that serve as agents of mass, solute, and heat fluxes. The Ocean Drilling Program (ODP) and Integrated Ocean Drilling Program (IODP) have provided important avenues to

  6. Hydrate control in deepwater drilling

    SciTech Connect

    NONE

    1997-09-01

    Gas-hydrate formation during deepwater offshore drilling and production is a well-recognized operational hazard. In water depths greater than 1,000 ft, seabed conditions of pressure and temperature become conducive to gas-hydrate formation. In a well-control situation, although the kick fluid leaves the formation at a high temperature, it can cool to seabed temperature with an extended shut-in period. With high enough hydrostatic pressure at the mudline, hydrates could form in the blowout-preventer (BOP) stack and choke and kill lines, as has been observed in field operations. The current practice in deepwater drilling is to suppress the hydrate-formation temperature by use of highly saline drilling fluids formulated from NaCl or other salts. This solution is applicable for the Gulf of Mexico but insufficient for the conditions encountered in Norwegian deep waters. At extreme water depths or extremely low mudline temperatures, this thermodynamic inhibition alone may not be sufficient to prevent hydrate formation. Instead, the use of kinetic inhibitors or crystal modifiers, in conjunction with thermodynamic inhibitors, may allow successful operations in such an environment. The definition of kinetic inhibitors (to distinguish them from the classic thermodynamic inhibitors, such as polar compounds and electrolytes) comes from the effect of the chemicals on the nucleation and growth of natural gas hydrates, both of which are time-dependent, stochastic processes. The paper describes deepwater drilling fluids, polar and surface-active additives, kinetic inhibition and crystal modifiers, laboratory measurements, and test results.

  7. Geothermal Drilling and Completion Technology Development Program. Quarterly progress report, October 1980-December 1980

    SciTech Connect

    Kelsey, J.R. (ed.)

    1981-03-01

    The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development.

  8. Drill string enclosure

    DOEpatents

    Jorgensen, D.K.; Kuhns, D.J.; Wiersholm, O.; Miller, T.A.

    1993-03-02

    The drill string enclosure consists of six component parts, including; a top bracket, an upper acrylic cylinder, an acrylic drill casing guide, a lower acrylic cylinder, a bottom bracket, and three flexible ducts. The upper acrylic cylinder is optional based upon the drill string length. The drill string enclosure allows for an efficient drill and sight operation at a hazardous waste site.

  9. WRITING ORAL DRILLS.

    ERIC Educational Resources Information Center

    NEY, JAMES W.

    ALL ORAL LANGUAGE DRILLS MAY BE SEPARATED INTO TWO TYPES--(1) MIM-MEM OR MIMICRY MEMORIZATION DRILLS OR (2) PATTERN PRACTICE DRILLS. THESE TWO LARGER CATEGORIES CAN BE SUB-DIVIDED INTO A NUMBER OF OTHER TYPES, SUCH AS TRANSFORMATION AND SUBSTITUTION DRILLS. THE USE OF ANY PARTICULAR TYPE DEPENDS ON THE PURPOSE TO WHICH THE DRILL IS PUT. IN ANY…

  10. Drill string enclosure

    DOEpatents

    Jorgensen, Douglas K. (Idaho Falls, ID); Kuhns, Douglass J. (Idaho Falls, ID); Wiersholm, Otto (Idaho Falls, ID); Miller, Timothy A. (Idaho Falls, ID)

    1993-01-01

    The drill string enclosure consists of six component parts, including; a top bracket, an upper acrylic cylinder, an acrylic drill casing guide, a lower acrylic cylinder, a bottom bracket, and three flexible ducts. The upper acrylic cylinder is optional based upon the drill string length. The drill string enclosure allows for an efficient drill and sight operation at a hazardous waste site.

  11. Balanced pressure techniques applied to geothermal drilling

    SciTech Connect

    Dareing, D.W.

    1981-08-01

    The objective of the study is to evaluate balanced pressure drilling techniques for use in combating lost circulation in geothermal drilling. Drilling techniques evaluated are: aerated drilling mud, parasite tubing, concentric drill pipe, jet sub, and low density fluids. Based on the present state of the art of balanced pressure drilling techniques, drilling with aerated water has the best overall balance of performance, risk, availability, and cost. Aerated water with a 19:1 free air/water ratio reduce maximum pressure unbalance between wellbore and formation pressures from 1000 psi to 50 psi. This pressure unbalance is within acceptable operating limits; however, air pockets could form and cause pressure surges in the mud system due to high percent of air. Low density fluids used with parasite tubing has the greatest potential for combating lost circulation in geothermal drilling, when performance only is considered. The top portion of the hole would be aerated through the parasite tube at a 10:1 free air/mud ratio and the low density mud could be designed so that its pressure gradient exactly matches the formation pore pressure gradient. The main problem with this system at present is the high cost of ceramic beads needed to produce low density muds.

  12. Chuck for delicate drills

    NASA Technical Reports Server (NTRS)

    Copeland, C. S.

    1972-01-01

    Development of oil film technique to couple power between drive spindle and drill chuck for delicate drilling operations is discussed. Oil film permits application of sufficient pressure, but stops rotating when drill jams. Illustration of equipment is provided.

  13. Metal drilling with portable hand drills

    NASA Technical Reports Server (NTRS)

    Edmiston, W. B.; Harrison, H. W.; Morris, H. E.

    1970-01-01

    Study of metal drilling solves problems of excessive burring, oversized holes, and out-of-round holes. Recommendations deal with using the proper chemical coolants, applying the coolants effectively, employing cutting oils, and dissipating the heat caused by drilling.

  14. Drilling optimization using drilling simulator software

    E-print Network

    Salas Safe, Jose Gregorio

    2004-09-30

    the results of using drilling simulator software called Drilling Optimization Simulator (DROPS®) in the evaluation of the Aloctono block, in the Pirital field, eastern Venezuela. This formation is characterized by very complex geology, containing faulted...

  15. Propagation of sound waves in drill strings

    NASA Astrophysics Data System (ADS)

    Drumheller, D. S.; Knudsen, S. D.

    1995-04-01

    Deep wells are commonly drilled while steering the drill bit. The steering process is completely controlled by the drilling-rig operator. A key element of this procedure is the measurement and communication of navigation information from the bottom of the well to the operator. Pressure pulses modulated onto the flow of the drill fluid are now employed in some cases to communicate this information. However, data rates are only a few binary bits per second with this method. This drastically limits the quantity of data available to the operator. As an alternative method, elastic waves generated within the steel drill string can be used as a carrier signal to transmit data. The drill string is commonly assembled from 10-m segments of threaded pipe and forms a periodic structure. The elastic wavelengths of interest are shorter than this periodic length. Consequently, these waves undergo significant dispersion. This paper presents new data for the propagation of elastic waves in a 2-km drill string. The influence of aperiodicity in the drill string, rotation of the drill string, and noise levels are studied in detail. The data verify a method for reducing the attenuation of a carrier signal by a factor of 2.

  16. Fluid induced seismicity guided by a continental fault: Injection experiment of 2004/2005 at the German Deep Drilling Site (KTB)

    NASA Astrophysics Data System (ADS)

    Shapiro, S. A.; Kummerow, J.; Dinske, C.; Asch, G.; Rothert, E.; Erzinger, J.; Kümpel, H.-J.; Kind, R.

    2006-01-01

    Recent hydraulic experiments at the KTB site have shown that seismicity induced by long-term fluid injection directly into a continental crustal fault remains guided by this fault. The seismicity is triggered by pressure perturbations as low as 0.01-1 bars at the hypocenters. A combination of sequential one-year fluid extraction (2002/2003) and one-year fluid injection (2004/2005) experiments has shown that only positive pore pressure perturbation (i.e., injections) was able to induce the seismicity. Moreover, the onset of seismicity roughly coincides with the time of compensation of the extracted fluid volume by the following injection. This confirms that the pressure diffusion is a dominant mechanism of seismicity triggering by fluid injections. The probed fault shows a significant anisotropy and non-linearity of its hydraulic behaviour. Its hydraulic diffusivity is up to one order of magnitude larger than that of surrounding rocks.

  17. Measurement-while-drilling essential to drilling

    SciTech Connect

    Fontenot, J.M.; Rao, M.V.

    1988-03-28

    During the next decade, measurement-while-drilling (MWD) technology will mature and become an essential part of drilling and formation evaluation. Especially in high angle/horizontal wells, more effective drilling and valuation will be possible. This concluding article in a series that began Jan. 25 focuses on limitations to using MWD that will be overcome. The use of MWD products and services will be expanded to include smaller holes, higher temperatures, faster and more frequent signals, more downhole memory, and additional sensors. These advances will lead to better formation evaluation, safer drilling, and increased drilling efficiency.

  18. New approaches to subglacial bedrock drilling technology

    NASA Astrophysics Data System (ADS)

    Talalay, Pavel; Sun, Youhong; Zhao, Yue; Xue, Jun; Chen, Chen; Markov, Alexey; Xu, Huiwen; Gong, Wenbin; Han, Wei; Zheng, Zhichuan; Cao, Pinlu; Wang, Rusheng; Zhang, Nan; Yu, Dahui; Fan, Xiaopeng; Hu, Zhengyi; Yang, Cheng; Han, Lili; Sysoev, Mikhail

    2013-04-01

    Drilling to bedrock of ice sheets and glaciers offers unique opportunities to research processes acting at the bed for paleo-climatic and paleo-environmental recording, basal sliding studies, subglacial geology and tectonics investigations, prospecting and exploration for minerals covered by ice. Retrieving bedrock samples under ice sheets and glaciers is a very difficult task. Drilling operations are complicated by extremely low temperature at the surface of, and within glaciers, and by glacier flow, the absence of roads and infrastructures, storms, winds, snowfalls, etc. In order to penetrate through the ice sheet or glacier up to the depth of at least 1000 m and to pierce the bedrock to the depth of several meters from ice - bedrock boundary the development activity already has been started in Polar Research Center at Jilin University, China. All drilling equipment (two 50-kW diesel generators, winch, control desk, fluid dumping station, etc.) is installed inside a movable sledge-mounted warm-keeping and wind-protecting drilling shelter that has dimensions of 8.8 ×2.8 × 3.0 m. Mast has two positions: horizontal for transportation and vertical working position (mast height is 12 m). Drilling shelter can be transported to the chosen site with crawler-tractor, aircraft or helicopter. In case of carriage by air the whole drilling shelter was designed to be disassembled into pieces "small" enough to ship by aircraft. Weight and sizes of each component has been minimized to lower the cost of transportation and to meet weight restrictions for transportation. Total weight of drilling equipment (without drilling fluid) is near 15 tons. Expected time of assembling and preparing for drilling is 2 weeks. If drilling shelter is transported with crawler-tractor (for example, in Antarctic traverses) all equipment is ready to start drilling immediately upon arrival to the site. To drill through ice and bedrock a new, modified version of the cable-suspended electromechanical ice core drill is designed and tested. The expected average daily production of ice drilling would be not less than 25 m/day. The lower part of the drill is adapted for coring bed-rock using special tooth diamond bit. Deep ice coring requires a drilling fluid in the borehole during operation in order to keep the hole open and to compensate the hydrostatic pressures acting to close it. At present there are no ideal low-temperature drilling fluids as all of them are environmental and health hazardous substances. The new approaches of subglacial bedrock drilling technology are connected with utilization of environmental friendly, low-toxic materials, e.g. low-molecular dimethyl siloxane oils or aliphatic synthetic ester of ESTISOL™ 140 type. They have suitable density-viscosity properties, and can be consider as a viable alternative for drilling in glaciers and subglacial bedrock.

  19. Rotary blasthole drilling update

    SciTech Connect

    Fiscor, S.

    2008-02-15

    Blasthole drilling rigs are the unsung heroes of open-pit mining. Recently manufacturers have announced new tools. Original equipment manufactures (OEMs) are making safer and more efficient drills. Technology and GPS navigation systems are increasing drilling accuracy. The article describes features of new pieces of equipment: Sandvik's DR460 rotary blasthole drill, P & H's C-Series drills and Atlas Copco's Pit Viper PV275 multiphase rotary blasthole drill rig. DrillNav Plus is a blasthole navigation system developed by Leica Geosystems. 5 photos.

  20. Laboratory tests to evaluate and study formation damage with low-density drill-in fluids (LDDIF) for horizontal well completions in low pressure and depleted reservoirs 

    E-print Network

    Chen, Guoqiang

    2002-01-01

    low concentrations of the HGS so that fluid rheology is not altered. We have conducted extensive laboratory testing to compare performance of the HGS LDDIF with that of conventional horizontal well DIFs. Experiments consisted of permeability regain...

  1. Horizontal well construction/completion process in a Gulf of Mexico unconsolidated sand: development of baseline correlations for improved drill-in fluid cleanup practices 

    E-print Network

    Lacewell, Jason Lawrence

    1999-01-01

    actual completion) process. Three main DIF types fluid types were considered during the planning process. These fluid types were: ~ MMH-Mixed Metal Hydroxide. ~ High ? density sized salt brine. ~ High ? density carbonate. The planning team..., the three DIF types and the key factors are presented: Table 2. 2 ? Three DIF Types Considered by the Well Planning Team. SYSTEM MMH (Mixed Metal OH) ADVANTAGES - Simple - No acid cleanup - Minimum invasion - Inexpensive DISADVANTAGES - Hard...

  2. Geothermal drilling technology update

    SciTech Connect

    Glowka, D.A.

    1997-04-01

    Sandia National Laboratories conducts a comprehensive geothermal drilling research program for the US Department of Energy, Office of Geothermal Technologies. The program currently includes seven areas: lost circulation technology, hard-rock drill bit technology, high-temperature instrumentation, wireless data telemetry, slimhole drilling technology, Geothermal Drilling Organization (GDO) projects, and drilling systems studies. This paper describes the current status of the projects under way in each of these program areas.

  3. Drilling tool

    SciTech Connect

    Kessler, J.

    1983-08-30

    A tool, which makes an undercut in the surface surrounding a drill hole in a layer of coal, has a plate which abuts against the surface at the inner end of the hole when the tool is inserted and which is installed at the front end of a rotary tubular guide for two bit holders constituting one-armed levers and having front portions provided with bits and being movable radially outwardly through windows in the guide. The rear portions of the holders are coupled to the front part of a reciprocal rotary shank which can be moved forwardly to expel the bits from the guide while moving the holder forwardly. When the shank is retracted, the bits are withdrawn into the guide. Such movements of the bits are caused by a transverse pin mounted in the guide and extending through elongated cam groove in the median portions of the holders. The configuration of surfaces flanking the cam grooves is such that the bits move outwardly during a first stage of forward movement of the shank relative to the guide and the bits thereupon remain in extended positions and make a cylindrical portion of the undercut in the surface surrounding the hole during the last stage of axial movement of the shank the guide. The tool is thereupon withdrawn and replaced with an anchor bolt which can be expanded against the surface portion surrounding the undercut and serves as a supporting or holding device.

  4. Geothermal drilling in Cerro Prieto

    SciTech Connect

    Dominguez, B.; Sanchez, G.

    1981-01-01

    To date, 71 goethermal wells have been drilled in Cerro Prieto. The activity has been divided into several stages, and, in each stage, attempts have been made to correct deficiencies that were gradually detected. Some of these problems have been solved; others, such as those pertaining to well casing, cement, and cementing jobs, have persisted. The procedures for well completion - the most important aspect for the success of a well - that were based on conventional oil well criteria have been improved to meet the conditions of the geothermal reservoir. Several technical aspects that have improved should be further optimized, even though the resolutions are considered to be reasonably satisfactory. Particular attention has been given to the development of a high-temperature drilling fluid capable of being used in drilling through lost circulation zones. Conventional oil well drilling techniques have been used except where hole-sloughing is a problem. Sulfonate lignitic mud systems have been used with good results. When temperatures exceed 300/sup 0/C (572/sup 0/F), it has been necessary to use an organic polymer to stabilize the mud properties.

  5. Geothermal Drilling in Cerro Prieto

    SciTech Connect

    Aguirre, B. D.; Garcia, G. S.

    1981-01-01

    To date, 71 geothermal wells have been drilled in Cerro Prieto. The activity has been divided into several stages, and, in each stage, attempts have been made to correct deficiencies that were gradually detected. Some of these problems have been solved; others, such as those pertaining to well casing, cement, and cementing jobs, have persisted. The procedures for well completion--the most important aspect for the success of a well--that were based on conventional oil well criteria have been improved to meet the conditions of the geothermal reservoir. Several technical aspects that have improved should be further optimized, even though the resolutions are considered to be reasonably satisfactory. Particular attention has been given to the development of a high-temperature drilling fluid capable of being used in drilling through lost circulation zones. Conventional oil well drilling techniques have been used except where hole-sloughing is a problem. Sulfonate lignitic mud systems have been used with good results. When temperatures exceed 300 C (572 F), it has been necessary to use an organic polymer to stabilize the mud properties.

  6. Ultrasonic drilling apparatus

    DOEpatents

    Duran, Edward L. (Santa Fe, NM); Lundin, Ralph L. (Los Alamos, NM)

    1989-01-01

    Apparatus attachable to an ultrasonic drilling machine for drilling deep holes in very hard materials, such as boron carbide, is provided. The apparatus utilizes a hollow spindle attached to the output horn of the ultrasonic drilling machine. The spindle has a hollow drill bit attached at the opposite end. A housing surrounds the spindle, forming a cavity for holding slurry. In operation, slurry is provided into the housing, and into the spindle through inlets while the spindle is rotating and ultrasonically reciprocating. Slurry flows through the spindle and through the hollow drill bit to cleanse the cutting edge of the bit during a drilling operation.

  7. Robotic Planetary Drill Tests

    NASA Technical Reports Server (NTRS)

    Glass, Brian J.; Thompson, S.; Paulsen, G.

    2010-01-01

    Several proposed or planned planetary science missions to Mars and other Solar System bodies over the next decade require subsurface access by drilling. This paper discusses the problems of remote robotic drilling, an automation and control architecture based loosely on observed human behaviors in drilling on Earth, and an overview of robotic drilling field test results using this architecture since 2005. Both rotary-drag and rotary-percussive drills are targeted. A hybrid diagnostic approach incorporates heuristics, model-based reasoning and vibration monitoring with neural nets. Ongoing work leads to flight-ready drilling software.

  8. Microbial community stratification controlled by the subseafloor fluid flow and geothermal gradient at the Iheya North hydrothermal field in the Mid-Okinawa Trough (Integrated Ocean Drilling Program Expedition 331).

    PubMed

    Yanagawa, Katsunori; Breuker, Anja; Schippers, Axel; Nishizawa, Manabu; Ijiri, Akira; Hirai, Miho; Takaki, Yoshihiro; Sunamura, Michinari; Urabe, Tetsuro; Nunoura, Takuro; Takai, Ken

    2014-10-01

    The impacts of lithologic structure and geothermal gradient on subseafloor microbial communities were investigated at a marginal site of the Iheya North hydrothermal field in the Mid-Okinawa Trough. Subsurface marine sediments composed of hemipelagic muds and volcaniclastic deposits were recovered through a depth of 151 m below the seafloor at site C0017 during Integrated Ocean Drilling Program Expedition 331. Microbial communities inferred from 16S rRNA gene clone sequencing in low-temperature hemipelagic sediments were mainly composed of members of the Chloroflexi and deep-sea archaeal group. In contrast, 16S rRNA gene sequences of marine group I Thaumarchaeota dominated the microbial phylotype communities in the coarse-grained pumiceous gravels interbedded between the hemipelagic sediments. Based on the physical properties of sediments such as temperature and permeability, the porewater chemistry, and the microbial phylotype compositions, the shift in the physical properties of the sediments is suggested to induce a potential subseafloor recharging flow of oxygenated seawater in the permeable zone, leading to the generation of variable chemical environments and microbial communities in the subseafloor habitats. In addition, the deepest section of sediments under high-temperature conditions (?90°C) harbored the sequences of an uncultivated archaeal lineage of hot water crenarchaeotic group IV that may be associated with the high-temperature hydrothermal fluid flow. These results indicate that the subseafloor microbial community compositions and functions at the marginal site of the hydrothermal field are highly affected by the complex fluid flow structure, such as recharging seawater and underlying hydrothermal fluids, coupled with the lithologic transition of sediments. PMID:25063666

  9. Department of Industrial Engineering Spring 2012 Project Name Quaker Chemical Effects of Tool Wear In Drilling of

    E-print Network

    Demirel, Melik C.

    of Tool Wear In Drilling of Compacted Graphite Iron, Grey Cast Iron, and High Molybdenum Grey Cast Iron Quakercool (old fluid) does Approach 276 holes drilled and reamed in each metal with each fluid using a CNC machining center Flank wear area on drills measured Thrust and torque forces collected Measurements

  10. JET-ASSISTED DRILLING WITH SUPERCRITICAL CARBON DIOXIDE

    Microsoft Academic Search

    J. J. Kollé; M. H. Marvin

    Under the pressure and temperature conditions found while drilling a typical oil or gas well, carbon dioxide exists as a supercritical fluid; with a density near that of water and extremely low viscosity. These properties should enhance jet erosion of rock and reduce dynamic confinement loads during mechanical drilling in a pressurized borehole. Jet erosion experiments, carried out with CO2

  11. Managed Pressure Drilling Candidate Selection 

    E-print Network

    Nauduri, Anantha S.

    2010-07-14

    Managed Pressure Drilling now at the pinnacle of the 'Oil Well Drilling' evolution tree, has itself been coined in 2003. It is an umbrella term for a few new drilling techniques and some preexisting drilling techniques, ...

  12. Deep Sea Drilling Project

    ERIC Educational Resources Information Center

    Kaneps, Ansis

    1977-01-01

    Discusses the goals of the ocean drilling under the International Phase of Ocean Drilling, which include sampling of the ocean crust at great depths and sampling of the sedimentary sequence of active and passive continental margins. (MLH)

  13. OPTIMIZATION OF MUD HAMMER DRILLING PERFORMANCE--A PROGRAM TO BENCHMARK THE VIABILITY OF ADVANCED MUD HAMMER DRILLING

    Microsoft Academic Search

    Arnis Judzis

    2004-01-01

    This document details the progress to date on the OPTIMIZATION OF MUD HAMMER DRILLING PERFORMANCE--A PROGRAM TO BENCHMARK THE VIABILITY OF ADVANCED MUD HAMMER DRILLING contract for the quarter starting January 2004 through March 2004. The DOE and TerraTek continue to wait for Novatek on the optimization portion of the testing program (they are completely rebuilding their fluid hammer). The

  14. Hydraulic wellbore erosion while drilling

    SciTech Connect

    Chemerinski, B. [British Borneo Exploration, Houston, TX (United States); Robinson, L. [OGCI, Houston, TX (United States)

    1996-12-01

    This article is the first to identify nozzle hydraulic effects in a field evaluation of hole erosion. Common practice normally identifies annular velocity as the culprit for excessive hole washout. But field tests in this article clearly identify excessive nozzle hydraulics as the cause for hole erosion. Both oil-based and water-based drilling fluids were used during the field test. The primary contribution of this study is a simple guideline to assist drillers in preventing excessive hole erosion. This article describes drilling conditions and caliper logs, and discusses sequences of events that could explain the observations. Some preliminary guidelines are presented so that drillers can prevent erosion of the wellbore from high shear rates at bit nozzles.

  15. Deepwater drilling advancements

    Microsoft Academic Search

    Mott

    1980-01-01

    Problems encountered and solved during the drilling of the record deepwater well, Blue H-28 (4876 ft), drilled off the coast of Gander, Newfoundland are reiterated. The fact that deepwater production of petroleum and natural gas has not kept pace with the technology for drilling deepwater wells is pointed out. New developments in technology for production from deepwater wells are discussed

  16. Ocean Drilling Program: Results from tenth year of drilling operations

    SciTech Connect

    Rabinowitz, P.D.; Francis, T.J.G.; Baldauf, J.G.; Coyne, J.C.; McPherson, R.G.; Merrill, R.B.; Olivas, R.E. [Texas A and M Univ., College Station, TX (United States)

    1995-12-01

    The Ocean Drilling Program (ODP) has completed 61 internationally staffed expeditions and ten years of scientific ocean drilling in search of answers relating to the tectonic evolution of passive and active continental margins, origin and evolution of oceanic crust, origin and evolution of marine sedimentary sequences, and paleoceanography. To address these problems, ODP has made numerous advances in technology for retrieval of continuous undisturbed cores under hostile environmental conditions. ODP curates over 198 km of cored material and associated scientific data bases and publishes results of the scientific expeditions in a continuous series of Proceedings volumes. During its tenth year, ODP continued its pioneering exploration in the Atlantic Ocean. This paper reviews the drilling activities associated with the Atlantic Leg of the project. It focuses on volcanic rifted margins and magma emplacement; the chemical composition and evolution of the lower crust and mantle; depth transect reconstruction for a variety of temporal resolutions; research on the Amazon deep-sea fan and associated paleoclimatology; temporal and spatial scales of fluid flow, the role of faults in fluid transport, and the relationships between mechanical state and seismicity in the northern Barbados accretionary prism; and the history of volcanic activity in the Canary Hotspot, the detailed evolution of large volcanic oceanic islands, the growth of volcanic aprons and the filling of the distal Madeira Abyssal Plain. Finally, Leg 158 investigated fluid flow, alteration and mineralization and associated geochemical fluxes, microbiological processes and the subsurface mixture of an active hydrothermal system on a slow spreading, sediment-free mid-ocean ridge (TAG area -- Mid Atlantic Ridge).

  17. A New Hole Cleaning Criteria for Drilling Operations of Oil Wells

    Microsoft Academic Search

    H. H. Rodríguez; O. M. Hernández; E. R. Acevedo; D. C. Velázquez; A. N. Conejo; R. D. Morales

    2003-01-01

    A study of drilling fluid flow in the annular space and drill pipe through residence time distribution (RTD) analysis of a tracer injected in impulse form while drilling an oil well is presented in this article. Two field trials were carried out in order to evaluate the technical feasibility and potential practical application of the RTD theory and the dispersion

  18. Combination offshore drilling rig

    SciTech Connect

    Lorenz, D.B.; Laid, J.S. II

    1986-07-29

    An offshore drilling rig is described for use in drilling into a formation below a body of water comprising a barge hull having a drilling slot extending inwardly from the peripheral boundary of the barge hull, means for supporting the barge hull in a position above the water, a cantilever structure mounted on the barge hull and movable horizontally with respect to such barge hull, the cantilever structure being so located relative to the drilling slot as to be movable horizontally into a position in vertical alignment with the drilling slot, a derrick and drilling machinery mounted to the cantilever structure and movable into a position above the drilling slot whereby well drilling operations may be conducted through the drilling slot, the cantilever structure also being movable horizontally to a position which locates the derrick and the drilling machinery outboard of the peripheral boundary of the barge hull, whereby a drilling operations may be conducted outside of the peripheral boundary of the barge hull, means mounted on the barge hull for moving the cantilever structure horizontally to different positions relative to the barge hull.

  19. System and method for damping vibration in a drill string

    DOEpatents

    Wassell, Mark Ellsworth (Kingwood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

    2007-05-22

    A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

  20. System and method for damping vibration in a drill string

    DOEpatents

    Wassell, Mark Ellsworth (Kingswood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

    2012-08-14

    A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

  1. System and method for damping vibration in a drill string

    DOEpatents

    Wassell, Mark Ellsworth (Kingwood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

    2008-05-27

    A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

  2. System and method for damping vibration in a drill string

    DOEpatents

    Wassell, Mark Ellsworth; Turner, William Evans; Burgess, Daniel E; Perry, Carl Allison

    2014-03-04

    A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

  3. System and method for damping vibration in a drill string

    DOEpatents

    Wassell, Mark Ellsworth (Kingwood, TX); Turner, William Evans (Durham, CT); Burgess, Daniel E. (Middletown, CT); Perry, Carl Allison (Middletown, CT)

    2011-08-16

    A system for damping vibration in a drill string can include a valve assembly having a supply of a fluid, a first member, and a second member capable of moving in relation to first member in response to vibration of the drill bit. The first and second members define a first and a second chamber for holding the fluid. Fluid can flow between the first and second chambers in response to the movement of the second member in relation to the first member. The valve assembly can also include a coil or a valve for varying a resistance of the fluid to flow between the first and second chambers.

  4. Characteristics and removal of filter cake formed by formate-based drilling mud

    E-print Network

    Alotaibi, Mohammed Badri

    2009-05-15

    cake. Drilling mud and completion fluids were obtained from the field. Compatibility tests between potassium formate brine, cleaning fluids, and formation brine were performed at 300ºF and 200 psi using HPHT visual cells. Surface tensions of various...

  5. Rotary Steerable Horizontal Directional Drilling: Red River Formation

    NASA Astrophysics Data System (ADS)

    Cherukupally, A.; Bergevin, M.; Jones, J.

    2011-12-01

    Sperry-Sun Drilling, a Halliburton company provides engineering solutions and sets new records for Horizontal and Vertical Displacement Drilling (HVDD). Halliburton Sperry Drilling, Casper, WY, allowed one student to participate in 12-week experiential learning program this summer as HVDD engineer. HVDD is the science of drilling non-vertical wells and can be differentiated into three main groups; Oilfield Directional Drilling (ODD), Utility Installation Directional Drilling (UIDD) and in-seam directional Drilling. Sperry-Sun prior experience with rotary drilling established a number of principles for the configuration of Bottom Hole Assembly (BHA) that would be prone to drilling crooked hole [1]. Combining Measurement While Drilling survey tools (MWD tools) and BHA designs made HVDD possible. Geologists use the MWD survey data to determine the well placement in the stratigraphic sequence. Through the analysis of this data, an apparent dip of the formation can be calculated, and the bit is directed to stay in the target zone of production. Geological modeling assists in directing the well by creating a map of the target zone surface, an Isopach map. The Isopach map provides contour intervals and changes in formation dip. When the inclination of the formation changes the geologist informs the directional drillers to adjust the drill bits. HVDD provides Halliburton the opportunity to reach more production intervals in a given formation sequence [1]. The Down hole motors powered by fluid flow through the drill string create horsepower and rotation of the bit which enables the use of a bend element in the BHA to create the tilt necessary to deviate the wellbore from vertical displacement drilling path. The rotation of Down hole motors is influenced by temperature and aromatics found in water, oil and diesel based mud. The development of HVDD Rotary Steerable tools hold promise to have almost a complete automated process for drilling highly deviated production well holes.

  6. Geothermal drilling and completion technology development program. Annual progress report, October 1979-September 1980

    SciTech Connect

    Varnado, S.G. (ed.)

    1980-11-01

    The progress, status, and results of ongoing research and development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

  7. Geothermal drilling and completion technology development program. Quarterly progress report, January-March 1980

    SciTech Connect

    Varnado, S.G. (ed.)

    1980-04-01

    The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

  8. Geothermal drilling ad completion technology development program. Semi-annual progress report, April-September 1979

    SciTech Connect

    Varnado, S.G. (ed.)

    1980-05-01

    The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, and completion technology. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1982 and by 50% by 1986.

  9. Geothermal drilling and completion technology development program. Quarterly progress report, October-December 1979

    SciTech Connect

    Varnado, S.G. (ed.)

    1980-01-01

    The progress, status, and results of ongoing Research and Development (R and D) within the Geothermal Drilling and Completion Technology Development Program are described. The program emphasizes the development of geothermal drilling hardware, drilling fluids, and completion technology. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1982 and by 50% by 1986.

  10. Geothermal drilling and completion technology development program. Quarterly progress report, April-June 1980

    SciTech Connect

    Varnado, S.G.

    1980-07-01

    The progress, status, and results of ongoing research and development (R and D) within the Geothermal Drilling and Completion Technology Development Program are reported. The program emphasizes the development of geothermal drilling hardware, drilling fluids, completion technology, and lost circulation control methods. Advanced drilling systems are also under development. The goals of the program are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987.

  11. The microbiology of drill mud cuttings from a new off-shore oilfield in Nigeria.

    PubMed

    Nnubia, C; Okpokwasili, G C

    1993-01-01

    Drilling-fluid-utilising microorganisms present in drill mud cuttings collected from the Agbara oilfield were isolated on mineral salts agar plates. Thirty-two isolates were obtained, 26 of which were Gram-positive bacteria and six fungi. The isolates were identified as Bacillus sp. (10), Staphylococcus sp. (12), Micrococcus sp. (2), Corynebacterium sp. (1), Nocardia sp. (1), and Penicillium sp. (6). Screen tests indicated that 27 (84.4%) of the isolates did not grow with any of the drilling fluids One Bacillus and three Staphylococcus spp. were strong primary utilisers of the drilling fluids. PMID:15091784

  12. An analysis of infill drilling

    SciTech Connect

    Gould, T.L.; Lake, L.W.; Munoz, M.

    1982-09-01

    Infill drilling of a pattern waterflood is a common practice in order to achieve accelerated production and improved recovery. Infill drilling is also performed for tertiary oil recovery projects in order to decrease project life and improve reservoir control. The purpose of this study was to analyze the effect of reservoir and fluid properties on infill performance and determine the conditions under which infilling is economically justified. Waterflood simulations were performed on single layer and multi-layer five spot symmetry elements. Infilling was performed at several water cuts in order to evaluate the effect of initial saturation distribution on oil rate decline characteristics. Infill decline characteristics and ''cut-cum'' analysis were compared with continuation of the existing waterflood to the economic limit. The authors show that infill drilling performance is sensitive to water cut at infill, oil viscosity, heterogeneity, and the degree of cross-flow between layers. Under the right conditions, infilling has three major benefits to a project: incremental recovery at the economic limit; accelerated oil production; and reduced operating cost through lower water cuts.

  13. MONITORING DRILLING BIT PARAMETERS ALLOWS OPTIMIZATION OF DRILLING RATES

    Microsoft Academic Search

    V. C. Kelessidis; P. Dalamarinis

    Drilling for mineral resources can be one of the most expensive processes in the exploration and production. Hence, drilling industry has been striving since its inception for developing drilling techniques which allow for fast drilling rates but ensuring the safety of the well and of the workers. Parameters affecting the drilling process can be cast in two major categories, rig

  14. 2007 OCEAN DRILLING CITATION REPORT Covering Deep Sea Drilling Project-

    E-print Network

    weekly from the GeoRef database. Users can also access the database via the USIO Web site (http2007 OCEAN DRILLING CITATION REPORT Covering Deep Sea Drilling Project- and Ocean Drilling Program approximately 22,500 citation records related to the Deep Sea Drilling Project (DSDP), Ocean Drilling Program

  15. Computational Fluid Dynamics Modeling of Pipe Eccentricity Effect on Flow Characteristics of Newtonian and Non-Newtonian Fluids

    Microsoft Academic Search

    M. Sorgun

    2011-01-01

    The prediction of accurate drilling fluids behavior inside an annulus is especially important in drilling engineering during hydraulic program design. The flow characteristics of Newtonian and non-Newtonian fluids drastically change in the annuli when the inner pipe is eccentric. In this study, the fluid flow inside concentric, partially eccentric, and fully eccentric annuli are modeled using computational fluid dynamics. Computational

  16. Carrier tracking apparatus and method for a logging-while-drilling system

    Microsoft Academic Search

    G. Schroeder; W. Waggener

    1980-01-01

    A logging-while-drilling apparatus for obtaining subsurface measurements during drilling in a fluid-filled borehole and for communicating the measurements to the surface of the earth comprises: a downhole sensing and transmitting subsystem including means mountable on a drill string for obtaining measurement information; means for generating acoustic carrier waves at a nominal frequency in the borehole fluid; means for psk modulating

  17. Apparatus and method for filtering signals in a logging-while-drilling system

    Microsoft Academic Search

    Waggener

    1980-01-01

    A logging-while-drilling apparatus for obtaining subsurface measurements during drilling in a fluid-filled borehole and for communicating the measurements to the surface of the earth, comprising: a downwhole sensing and transmitting subsystem including means mountable on a drill string for obtaining measurement information; means for generating acoustic carrier waves at a nominal frequency in the borehole fluid; means for psk modulating

  18. New drilling rigs

    Microsoft Academic Search

    Tubb

    1981-01-01

    Friede and Goldman Ltd. of New Orleans, Louisiana has a successful drilling rig, the L-780 jack-up series. The triangular-shaped drilling vessel measures 180 x 176 ft. and is equipped with three 352 ft legs including spud cans. It is designed to work in up to 250 ft waters and drill to 20,000 ft depths. The unit is scheduled to begin

  19. Remote drill bit loader

    DOEpatents

    Dokos, J.A.

    1997-12-30

    A drill bit loader is described for loading a tapered shank of a drill bit into a similarly tapered recess in the end of a drill spindle. The spindle has a transverse slot at the inner end of the recess. The end of the tapered shank of the drill bit has a transverse tang adapted to engage in the slot so that the drill bit will be rotated by the spindle. The loader is in the form of a cylinder adapted to receive the drill bit with the shank projecting out of the outer end of the cylinder. Retainer pins prevent rotation of the drill bit in the cylinder. The spindle is lowered to extend the shank of the drill bit into the recess in the spindle and the spindle is rotated to align the slot in the spindle with the tang on the shank. A spring unit in the cylinder is compressed by the drill bit during its entry into the recess of the spindle and resiliently drives the tang into the slot in the spindle when the tang and slot are aligned. 5 figs.

  20. Remote drill bit loader

    SciTech Connect

    Dokos, James A. (Idaho Falls, ID)

    1997-01-01

    A drill bit loader for loading a tapered shank of a drill bit into a similarly tapered recess in the end of a drill spindle. The spindle has a transverse slot at the inner end of the recess. The end of the tapered shank of the drill bit has a transverse tang adapted to engage in the slot so that the drill bit will be rotated by the spindle. The loader is in the form of a cylinder adapted to receive the drill bit with the shank projecting out of the outer end of the cylinder. Retainer pins prevent rotation of the drill bit in the cylinder. The spindle is lowered to extend the shank of the drill bit into the recess in the spindle and the spindle is rotated to align the slot in the spindle with the tang on the shank. A spring unit in the cylinder is compressed by the drill bit during its entry into the recess of the spindle and resiliently drives the tang into the slot in the spindle when the tang and slot are aligned.

  1. Horizontal drilling developments

    SciTech Connect

    Gust, D.

    1997-05-01

    The advantages of horizontal drilling are discussed. Use of horizontal drilling has climbed in the past half decade as technology and familiarity offset higher costs with higher production rates and greater recoveries from new and existing wells. In essence, all types of horizontal wells expose a larger section of the reservoir to the wellbore with a resulting increase in flow rates. (A horizontal well may also be drilled to provide coning control or to intersect vertical fractures.) Thus, drilling horizontally, both onshore and offshore, reduces the number of wells necessary to develop a field.

  2. Study for increasing micro-drill reliability by vibrating drilling

    Microsoft Academic Search

    Yang Zhaojun; Li Wei; Chen Yanhong; Wang Lijiang

    1998-01-01

    A study for increasing micro-drill reliability by vibrating drilling is described. Under the experimental conditions of this study it is observed, from reliability testing and the fitting of a life-distribution function, that the lives of micro-drills under ordinary drilling follow the log-normal distribution and the lives of micro-drills under vibrating drilling follow the Weibull distribution. Calculations for reliability analysis show

  3. New Era of Scientific Ocean Drilling

    NASA Astrophysics Data System (ADS)

    Eguchi, N.; Toczko, S.; Sanada, Y.; Igarashi, C.; Kubo, Y.; Maeda, L.; Sawada, I.; Takase, K.; Kyo, N.

    2014-12-01

    The D/V Chikyu, committed to scientific ocean drilling since 2007, has completed thirteen IODP expeditions, and Chikyu's enhanced drilling technology gives us the means to reach deep targets, enhanced well logging, deep water riserless drilling, and state of the art laboratory. Chikyu recovered core samples from 2466 meters below sea floor (mbsf) in IODP Exp. 337, and drilled to 3058.5 mbsf in IODP Exp. 348, but these are still not the limit of Chikyu's capability. As deep as these depths are, they are just halfway to the 5200 mbsf plate boundary target for the NanTroSEIZE deep riser borehole. There are several active IODP proposals in the pipeline. Each has scientific targets requiring several thousand meters of penetration below the sea floor. Riser technology is the only way to collect samples and data from that depth. Well logging has been enhanced with the adoption of riser drilling, especially for logging-while-drilling (LWD). LWD has several advantages over wireline logging, and provides more opportunities for continuous measurements even in unstable boreholes. Because of the larger diameter of riser pipes and enhanced borehole stability, Chikyu can use several state-of-the-art downhole tools, e.g. fracture tester, fluid sampling tool, wider borehole imaging, and the latest sonic tools. These new technologies and tools can potentially expand the envelope of scientific ocean drilling. Chikyu gives us access to ultra-deep water riserless drilling. IODP Exp. 343/343T investigating the March 2011 Tohoku Oki Earthquake, explored the toe of the landward slope of the Japan Trench. This expedition reached the plate boundary fault target at more than 800 mbsf in water depths over 6900 m for logging-while-drilling, coring, and observatory installation. This deep-water drilling capability also expands the scientific ocean drilling envelope and provides access to previously unreachable targets. On top of these operational capabilities, Chikyu's onboard laboratory is equipped with state-of-the-art instruments to analyze all science samples. X-ray CT creates non-destructive 3D images of core samples providing high resolution structural detail. The microbiology laboratory offers clean and contamination-free work environments required for microbiological samples.

  4. JOIDES Resolution Drill Ship Drill into Indian Ridge MOHO Hole Cleaning Study

    E-print Network

    Lindanger, Catharina

    2014-05-03

    with saltwater. ........................................................................... 74 xiii LIST OF TABLES Page Table 3.1 – Rheological data for sepiolite drilling fluid (Carney and Meyer 1976... for efficiently lifting cuttings. The attapulgite has proven very stable at high temperatures and will be a good additive for sweeps when cleaning the hole (Carney and Meyer 1976). The attapulgite structure consists of a two-dimensional layer structure more...

  5. Managed Pressure Drilling Candidate Selection

    E-print Network

    Nauduri, Anantha S.

    2010-07-14

    drilling hydraulics calculations and simulations. Most of them are designed for conventional well hydraulics, while some can perform Underbalanced Drilling calculations, and a select few can perform Managed Pressure Drilling calculations. Most of the few...

  6. Drill-motor holding fixture

    NASA Technical Reports Server (NTRS)

    Chartier, E. N.; Culp, L. N.

    1980-01-01

    Guide improves accuracy and reduces likelihood of bit breakage in drilling large work pieces. Drill motor is mounted on pipe that slides on furniture clamp. Drill is driven into work piece by turning furniture-clamp handle.

  7. Data transmission element for downhole drilling components

    DOEpatents

    Hall, David R. (Provo, UT); Hall, Jr., H. Tracy (Provo, UT); Pixton, David S. (Lehi, UT); Dahlgren, Scott (Provo, UT); Fox, Joe (Spanish Fork, UT); Sneddon, Cameron (Provo, UT); Briscoe, Michael (Lehi, UT)

    2006-01-31

    A robust data transmission element for transmitting information between downhole components, such as sections of drill pipe, in the presence of hostile environmental conditions, such as heat, dirt, rocks, mud, fluids, lubricants, and the like. The data transmission element components include a generally U-shaped annular housing, a generally U-shaped magnetically conductive, electrically insulating element such as ferrite, and an insulated conductor. Features on the magnetically conducting, electrically insulating element and the annular housing create a pocket when assembled. The data transmission element is filled with a polymer to retain the components within the annular housing by filling the pocket with the polymer. The polymer can bond with the annular housing and the insulated conductor but preferably not the magnetically conductive, electrically insulating element. A data transmission element is mounted within a recess proximate a mating surface of a downhole drilling component, such as a section of drill pipe.

  8. Reverse laser drilling

    NASA Technical Reports Server (NTRS)

    Anthony, Thomas R. (Inventor)

    1984-01-01

    This invention provides a method for laser drilling small diameter, closely-spaced, and accurately located holes in a body of material which is transparent or substantially transparent to the laser radiation employed whereby the holes are drilled through the thickness of the body from the surface opposite to that on which the laser beam impinges to the surface of laser beam impingement.

  9. Ultrasonic Drilling and Coring

    NASA Technical Reports Server (NTRS)

    Bar-Cohen, Yoseph

    1998-01-01

    A novel drilling and coring device, driven by a combination, of sonic and ultrasonic vibration, was developed. The device is applicable to soft and hard objects using low axial load and potentially operational under extreme conditions. The device has numerous potential planetary applications. Significant potential for commercialization in construction, demining, drilling and medical technologies.

  10. Crustal observations through drilling

    Microsoft Academic Search

    Barry Raliegh

    1984-01-01

    The use of the drill to probe the earth's crust, driven by primarily economic incentives, has come a long way since the first oil well at Titusville, Penn., began producing torn a depth of 21 m in 1859. Wells have now been drilled to depths of over 12 km (in the Kola Peninsula of the Soviet Union), in rocks where

  11. Advanced drilling systems

    SciTech Connect

    Pierce, K.G.; Finger, J.T. [Sandia National Labs., Albuquerque, NM (United States); Livesay, B.J. [Livesay Consultants, San Diego, CA (United States)

    1995-12-31

    Drilling is ubiquitous in oil, gas, geothermal, minerals, water well, and mining industries. Drilling and well completion account for 25% to 50% of the cost of producing power from geothermal energy. Reduced drilling costs will reduce the cost of electricity produced from geothermal resources. Undoubtedly, there are concepts for advanced drilling systems that have yet to be studied. However, the breadth and depth of previous efforts in this area almost guarantee that any new efforts will at least initially build on an idea or a variation of an idea that has already been investigated. Therefore, a review of previous efforts, coupled with a characterization of viable advanced drilling systems and the current state of technology as it applies to those systems, provide the basis for this study.

  12. Distributed downhole drilling network

    DOEpatents

    Hall, David R.; Hall, Jr., H. Tracy; Fox, Joe; Pixton, David S.

    2006-11-21

    A high-speed downhole network providing real-time data from downhole components of a drilling strings includes a bottom-hole node interfacing to a bottom-hole assembly located proximate the bottom end of a drill string. A top-hole node is connected proximate the top end of the drill string. One or several intermediate nodes are located along the drill string between the bottom-hole node and the top-hole node. The intermediate nodes are configured to receive and transmit data packets transmitted between the bottom-hole node and the top-hole node. A communications link, integrated into the drill string, is used to operably connect the bottom-hole node, the intermediate nodes, and the top-hole node. In selected embodiments, a personal or other computer may be connected to the top-hole node, to analyze data received from the intermediate and bottom-hole nodes.

  13. Coiled-tubing drilling

    SciTech Connect

    Leising, L.J.; Newman, K.R.

    1993-12-01

    For several years, CT has been used to drill scale and cement in cased wells. Recently, CT has been used (in place of a rotary drilling rig) to drill vertical and horizontal open holes. At this time, < 30 openhole CT drilling (CTD) jobs have been performed. However, there is a tremendous interest in this technique in the oil industry; many companies are actively involved in developing CTD technology. This paper discusses CTD applications and presents an engineering analysis of CTD. This analysis attempts to define the limits of what can and cannot be done with CTD. These limits are calculated with CT and drilling models used for other applications. The basic limits associated with CTD are weight and size, CT force and life, and hydraulic limits. Each limit is discussed separately. For a specific application, each limit must be considered.

  14. Evaluation of an air drilling cuttings containment system

    SciTech Connect

    Westmoreland, J.

    1994-04-01

    Drilling at hazardous waste sites for environmental remediation or monitoring requires containment of all drilling fluids and cuttings to protect personnel and the environment. At many sites, air drilling techniques have advantages over other drilling methods, requiring effective filtering and containment of the return air/cuttings stream. A study of. current containment methods indicated improvements could be made in the filtering of radionuclides and volatile organic compounds, and in equipment like alarms, instrumentation or pressure safety features. Sandia National Laboratories, Dept. 61 11 Environmental Drilling Projects Group, initiated this work to address these concerns. A look at the industry showed that asbestos abatement equipment could be adapted for containment and filtration of air drilling returns. An industry manufacturer was selected to build a prototype machine. The machine was leased and put through a six-month testing and evaluation period at Sandia National Laboratories. Various materials were vacuumed and filtered with the machine during this time. In addition, it was used in an actual air drive drilling operation. Results of these tests indicate that the vacuum/filter unit will meet or exceed our drilling requirements. This vacuum/filter unit could be employed at a hazardous waste site or any site where drilling operations require cuttings and air containment.

  15. Gas Well Drilling and Water Resources Regulated by the Pennsylvania Oil and

    E-print Network

    Boyer, Elizabeth W.

    used in drilling and fracking · Recent increase in permit fee to fund new DEP enforcement · Permit fluids ­ return fluids from fracking ­ mixture of water, sand and chemicals Production fluids ­ fluids, manganese, barium, arsenic, etc.) Surfactants/detergents Total suspended solids Oil/Grease Fracking

  16. Mixer for drill cuttings and drilling mud on a drilling location

    Microsoft Academic Search

    J. G. J. van der Laan; W. Entrop

    1985-01-01

    A device for mixing of liquids and particulate solids, such as for instance a drilling liquid and drill cuttings on a drilling location. This drilling location can be a deep well drilled for gas and\\/or oil by means of a drilling tower on-or off-shore. The invention provides an elongated, rectangular open mixing tank on which a series of replacable agitating

  17. DRILLED HYDROTHERMAL ENERGY Drilling for seawater

    E-print Network

    Water Desalination Fuel Production Waste Water Treatment Increased CO2 Absorbtion Agriculture & Mari) of cold water pipe WAS LOST 3 TIMES before demonstrating power generation #12;DRILLED HYDROTHERMAL ENERGY BACKGROUND After a 2006 earthquake on the Big Island The NELHA cold water pipe cracked allowing warm water

  18. Soil Contamination by Oil and Gas Drilling and Production Operations in Padre Island National Seashore, Texas, U.S.A

    Microsoft Academic Search

    E. G. Carls; Dennis B. Fenn; Scott A. Chaffey

    1995-01-01

    Soil samples from 18 oil and gas drilling and production sites located in Padre Island National Seashore were analyzed for contaminating substances associated with drilling fluids and petroleum products. The results of the investigation indicate that soil contamination from these sources is widespread and persistent but generally localized in the immediate vicinity of drilling and production activity. Sixteen sites were

  19. Rotary drill bit

    SciTech Connect

    Zijisling, D.H.

    1988-12-20

    This patent describes a rotary drill bit for deephole drilling in subsurface earth formations, the bit suitable to be coupled to the lower end of a drill string, the bit body having a center region near a central axis of rotation and an outer region further removed from the central axis; and a plurality of cutting elements protruding from the bit body. The cutting elements comprising a front layer of interbonded abrasive particles, wherein the cutting elements located in the center region of the bit comprise a thicker abrasive front layer than those in the outer region of the bit.

  20. Rapid and Quiet Drill

    NASA Technical Reports Server (NTRS)

    Sherrit, Stewart; Badescu, Mircea; Bar-Cohen, Yoseph; Chang, Zensheu; Bao, Xiaoqi

    2007-01-01

    This describes aspects of the rapid and quiet drill (RAQD), which is a prototype apparatus for drilling concrete or bricks. The design and basic principle of operation of the RAQD overlap, in several respects, with those of ultrasonic/ sonic drilling and coring apparatuses described in a number of previous NASA Tech Briefs articles. The main difference is that whereas the actuation scheme of the prior apparatuses is partly ultrasonic and partly sonic, the actuation scheme of the RAQD is purely ultrasonic. Hence, even though the RAQD generates considerable sound, it is characterized as quiet because most or all of the sound is above the frequency range of human hearing.

  1. Using Bayesian Network to Develop Drilling Expert Systems 

    E-print Network

    Alyami, Abdullah

    2012-10-19

    was developed to control solids in drilling fluids using flow charts, (Pandey and Osisanya 2004). An underbalanced drilling expert system based on fuzzy logic was developed to perform screening decisions. These decisions include whether to use underbalanced... on Fuzzy logic was developed. The expert system included a screening process for planning multilateral well candidates, lateral completion and junction level. Flow charts were linked to a computer program, Garrouch et al. (2004). 4 The purpose...

  2. Ultra-Deep Drilling Cost Reduction; Design and Fabrication of an Ultra-Deep Drilling Simulator (UDS)

    SciTech Connect

    Lindstrom, Jason

    2010-01-31

    Ultra-deep drilling, below about 20,000 ft (6,096 m), is extremely expensive and limits the recovery of hydrocarbons at these depths. Unfortunately, rock breakage and cuttings removal under these conditions is not understood. To better understand and thus reduce cost at these conditions an ultra-deep single cutter drilling simulator (UDS) capable of drill cutter and mud tests to sustained pressure and temperature of 30,000 psi (207 MPa) and 482 °F (250 °C), respectively, was designed and manufactured at TerraTek, a Schlumberger company, in cooperation with the Department of Energy’s National Energy Technology Laboratory. UDS testing under ultra-deep drilling conditions offers an economical alternative to high day rates and can prove or disprove the viability of a particular drilling technique or fluid to provide opportunity for future domestic energy needs.

  3. December 2001 OCEAN DRILLING PROGRAM

    E-print Network

    December 2001 OCEAN DRILLING PROGRAM LEG 203 SCIENTIFIC PROSPECTUS DRILLING AT THE EQUATORIAL -------------------------------- Dr. Jack Bauldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University. Acton Leg Project Manager and Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery

  4. January 2003 OCEAN DRILLING PROGRAM

    E-print Network

    January 2003 OCEAN DRILLING PROGRAM LEG 210 SCIENTIFIC PROSPECTUS DRILLING THE NEWFOUNDLAND HALF Baldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University 1000 Discovery Manager and Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College

  5. Well drilling operation control procedure

    Microsoft Academic Search

    Bourdon

    1989-01-01

    This patent describes a test procedure carried out during well drilling operations for monitoring rotary type well drilling operations, by means of a drill string fitted at its lower end with a bit and suspended by its upper end, at the surface, from a hook from the drill rig. It comprises: applying a certain initial weight to the bit; keeping

  6. DRILLING FLUID CHEMICALS AND EARTHWORM TOXICITY

    Microsoft Academic Search

    Karen McCosh; Jonathan Getliff

    Earthworms can be used to assess toxicity in terrestrial systems and the survival rate of the worms, or changes in other parameters such as biomass, can be used to calculate an LC50 value (lethal concentration to 50% of the population) for test chemicals spiked into soil. This type of information can be useful in predicting the likely toxicological effect of

  7. Effects of the Terra Nova offshore oil development on benthic macro-invertebrates over 10 years of development drilling on the Grand Banks of Newfoundland, Canada

    NASA Astrophysics Data System (ADS)

    Paine, Michael D.; DeBlois, Elisabeth M.; Kilgour, Bruce W.; Tracy, Ellen; Pocklington, Patricia; Crowley, Roger D.; Williams, Urban P.; Gregory Janes, G.

    2014-12-01

    This paper describes effects of drilling with water and synthetic-based drilling muds on benthic macro-invertebrates over 10 years at the Terra Nova offshore oil development. As such, the paper provides insight on the effects of relatively new synthetic-based drilling muds (SBMs), and makes an important contribution to our understanding of the long-term chronic effects of drilling on benthic communities. The Terra Nova Field is located approximately 350 km offshore on the Grand Banks of Newfoundland (Canada). Sediment and invertebrate samples were collected in 1997 (baseline) prior to drilling, and subsequently in 2000, 2001, 2002, 2004, 2006, 2008 and 2010. Approximately 50 stations were sampled in each year at distances of less than 1 to approximately 20 km from drill centres. Summary benthic invertebrate community measures examined were total abundance, biomass, richness, diversity and multivariate measures of community composition based on non-Metric Dimensional Scaling (nMDS). Decreases in abundance, biomass and richness were noted at one station located nearest (0.14 km) to a drill centre in some environmental effects monitoring (EEM) years. These decreases coincided with higher levels of tracers of drill muds in sediments (barium and >C10-C21 hydrocarbons). Abundances of selected individual taxa were also examined to help interpret responses when project-related effects on summary measures occurred. Enrichment effects on some tolerant taxa (e.g., the polychaete family Phyllodocidae and the bivalve family Tellinidae) and decreased abundances of sensitive taxa (e.g., the polychaete families Orbiniidae and Paraonidae) were detected to within approximately 1-2 km from discharge source. Lagged responses three to five years after drilling started were noted for Phyllodocidae and Tellinidae, suggesting chronic or indirect effects. Overall, results of benthic community analyses at Terra Nova indicate that effects on summary measures of community composition were spatially limited but, as seen elsewhere, some taxa were more sensitive to drilling discharges.

  8. Biological treatment of drilling waste

    SciTech Connect

    Perie, F.H.; Seris, J.L.; Martignon, A.P.

    1995-12-01

    Off shore operators are now faced with more stringent forthcoming regulations regarding waste discharge. Several aspects are to be taken into account when considering waste disposal in the sea; among them, the total amount of COD and the toxicity. While, in many regards, the problem caused by the processing fluids toxicity has been addressed, the elimination of residual COD from the waste is yet to be solved. Biodegradation of drilling waste is one of the major routes taken by third party contracters to address the reduction of COD in sea-discharged cuttings. This report describes a technique specifically developed to enhance drilling waste biodegradation under selected conditions. The suggested treatment involved biological catalysts used in conjunction with or prior to the biodegradation. We demonstrated that the considered environment-compatible substitute for oil-based mud could be more efficiently biodegraded if an enzymatic pretreatment was carried out prior to or during the actual biodegradation. The biodegradation rate, expressed as CO{sub 2} envolvement, was significantly higher in lipase-treated cultures. In addition, we demonstrated that this treatment was applicable to substrates in emulsion, suspension, or adsorbed on solid.

  9. While drilling system and method

    DOEpatents

    Mayes, James C.; Araya, Mario A.; Thorp, Richard Edward

    2007-02-20

    A while drilling system and method for determining downhole parameters is provided. The system includes a retrievable while drilling tool positionable in a downhole drilling tool, a sensor chassis and at least one sensor. The while drilling tool is positionable in the downhole drilling tool and has a first communication coupler at an end thereof. The sensor chassis is supported in the drilling tool. The sensor chassis has a second communication coupler at an end thereof for operative connection with the first communication coupler. The sensor is positioned in the chassis and is adapted to measure internal and/or external parameters of the drilling tool. The sensor is operatively connected to the while drilling tool via the communication coupler for communication therebetween. The sensor may be positioned in the while drilling tool and retrievable with the drilling tool. Preferably, the system is operable in high temperature and high pressure conditions.

  10. Deep-Sea Drilling.

    ERIC Educational Resources Information Center

    White, Stan M.

    1979-01-01

    Drilling during 1978 focused on three major geologic problems: the nature and origin of the oceanic crust, the nature and geologic history of the active continental margins, and the oceanic paleoenvironment. (Author/BB)

  11. Drilling Productivity Report

    EIA Publications

    2015-01-01

    Energy Information Administration’s (EIA) new Drilling Productivity Report (DPR) takes a fresh look at oil and natural gas production, starting with an assessment of how and where drilling for hydrocarbons is taking place. The DPR uses recent data on the total number of drilling rigs in operation along with estimates of drilling productivity and estimated changes in production from existing oil and natural gas wells to provide estimated changes in oil and natural gas production for six key fields. EIA's approach does not distinguish between oil-directed rigs and gas-directed rigs because once a well is completed it may produce both oil and gas; more than half of the wells produce both.

  12. Sub-Ocean Drilling

    NASA Technical Reports Server (NTRS)

    1981-01-01

    The National Science Foundation (NSF) initialized a new phase of exploration last year, a 10 year effort jointly funded by NSF and several major oil companies, known as the Ocean Margin Drilling Program (OMDP). The OMDP requires a ship with capabilities beyond existing drill ships; it must drill in 13,000 feet of water to a depth 20,000 feet below the ocean floor. To meet requirements, NSF is considering the conversion of the government-owned mining ship Glomar Explorer to a deep ocean drilling and coring vessel. Feasibility study performed by Donhaiser Marine, Inc. analyzed the ship's characteristics for suitability and evaluated conversion requirement. DMI utilized COSMIC's Ship Motion and Sea Load Computer program to perform analysis which could not be accomplished by other means. If approved for conversion, Glomar Explorer is expected to begin operations as a drillship in 1984.

  13. Drill pipe protector development

    SciTech Connect

    Thomerson, C.; Kenne, R. [Regal International Corp., Corsicanna, TX (United States); Wemple, R.P. [Sandia National Lab., Albuquerque, NM (United States)] [ed.] [and others

    1996-03-01

    The Geothermal Drilling Organization (GDO), formed in the early 1980s by the geothermal industry and the U.S. Department of Energy (DOE) Geothermal Division, sponsors specific development projects to advance the technologies used in geothermal exploration, drilling, and production phases. Individual GDO member companies can choose to participate in specific projects that are most beneficial to their industry segment. Sandia National Laboratories is the technical interface and contracting office for the DOE in these projects. Typical projects sponsored in the past have included a high temperature borehole televiewer, drill bits, muds/polymers, rotary head seals, and this project for drill pipe protectors. This report documents the development work of Regal International for high temperature geothermal pipe protectors.

  14. Thermal spallation drilling

    SciTech Connect

    Williams, R.E.

    1985-01-01

    Thermal spallation drilling is an underdeveloped process with great potential for reducing the costs of drilling holes and mining shafts and tunnels in most very hard rocks. Industry has used this process to drill blast holes for emplacing explosives and to quarry granite. Some theoretical work has been performed, and many signs point to a great future for this process. The Los Alamos National Laboratory has studied the theory of the spallation process and is conducting experiments to prove out the system and to adapt it for use with a conventional rotary rig. This report describes work that has been accomplished at the Laboratory on the development of thermal spallation drilling and some work that is projected for the future on the system. 3 references, 3 figures.

  15. Subsurface drill string

    DOEpatents

    Casper, William L. (Rigby, ID); Clark, Don T. (Idaho Falls, ID); Grover, Blair K. (Idaho Falls, ID); Mathewson, Rodney O. (Idaho Falls, ID); Seymour, Craig A. (Idaho Falls, ID)

    2008-10-07

    A drill string comprises a first drill string member having a male end; and a second drill string member having a female end configured to be joined to the male end of the first drill string member, the male end having a threaded portion including generally square threads, the male end having a non-threaded extension portion coaxial with the threaded portion, and the male end further having a bearing surface, the female end having a female threaded portion having corresponding female threads, the female end having a non-threaded extension portion coaxial with the female threaded portion, and the female end having a bearing surface. Installation methods, including methods of installing instrumented probes are also provided.

  16. Micro borehole drilling platform

    SciTech Connect

    NONE

    1996-10-01

    This study by CTES, L.C. meets two main objectives. First, evaluate the feasibility of using coiled tubing (CT) to drill 1.0 inches-2.5 inches diameter directional holes in hard rocks. Second, develop a conceptual design for a micro borehole drilling platform (MBDP) meeting specific size, weight, and performance requirements. The Statement of Work (SOW) in Appendix A contains detailed specifications for the feasibility study and conceptual design.

  17. Hydrogeologic Testing During Drilling of COSC-1 Borehole: Application of FFEC Logging Method

    NASA Astrophysics Data System (ADS)

    Tsang, Chin-Fu; Rosberg, Jan-Erik; Sharma, Prabhakar; Niemi, Auli; Juhlin, Christopher

    2015-04-01

    Drilling of a deep borehole does not normally allow for hydrogeologic testing during the drilling period. The only time hydraulic testing is done during the drilling operations is when drilling experiences a large loss (or high return) of drilling fluid representing encountering of a large-transmissivity zone. Then, either the zone is cemented for drilling to continue or drilling is stopped for conducting, for example, a drill-stem test (DST), which involves installation of a packer above the drilling depth and performing a pressure or flow transient test. The first alternative means loss of critical information on in-situ hydraulic transmissivities and the second option enables the study of only the one high-transmissivity zone, with a significant delay of the drilling schedule. The drilling of the COSC-1 borehole at Åre, Northern Sweden, presented an opportunity of conducting a particular hydraulic testing with negligible impact on drilling schedule, yet providing important and accurate information on in-situ hydraulic conductivities on both high- and low-transmissivity zones, already during the drilling period. This information can be used to guide downhole fluid sampling programs and future detailed borehole testing. The particular testing method used is the Flowing Fluid Electric Conductivity (FFEC) Logging Method, which has the capability of identifying large and small hydraulically active zones and providing data for estimating their transmissivity values and local formation water salinity. In this paper, the method will be described and its application to the drilling of COSC-1 borehole presented. Results show that from 300 m to the borehole bottom at 2500 m, there are eight hydraulic active zones in COSC-1, with very low transmissivity values which range over one order of magnitude.

  18. Self-balancing drilling assembly and apparatus

    SciTech Connect

    Beynet, P.A.; Brett, J.F.; Warren, T.M.

    1990-03-06

    This patent describes a self-balancing apparatus for automatically compensating certain imbalances which tend to cause vibrations in a rotating drill bit. It comprises: a support body including two ends and first and second circular races defined circumferentially around said support body. The first race disposed near one end of said support body and said second race disposed nearer the other end of said support body; a fluid received in said first race; a fluid received in said second race; pressure compensating means for compensating for pressure differentials between said fluids and a fluid external to said support body; a first plurality of movable balls or rollers disposed in said first race; a second plurality of movable balls or rollers disposed in said second race; a first sleeve receiving the portion of said support body where said first race is defined; and a second sleeve receiving the portion of said support body where said second race is defined.

  19. Advanced Seismic While Drilling System

    SciTech Connect

    Robert Radtke; John Fontenot; David Glowka; Robert Stokes; Jeffery Sutherland; Ron Evans; Jim Musser

    2008-06-30

    A breakthrough has been discovered for controlling seismic sources to generate selectable low frequencies. Conventional seismic sources, including sparkers, rotary mechanical, hydraulic, air guns, and explosives, by their very nature produce high-frequencies. This is counter to the need for long signal transmission through rock. The patent pending SeismicPULSER{trademark} methodology has been developed for controlling otherwise high-frequency seismic sources to generate selectable low-frequency peak spectra applicable to many seismic applications. Specifically, we have demonstrated the application of a low-frequency sparker source which can be incorporated into a drill bit for Drill Bit Seismic While Drilling (SWD). To create the methodology of a controllable low-frequency sparker seismic source, it was necessary to learn how to maximize sparker efficiencies to couple to, and transmit through, rock with the study of sparker designs and mechanisms for (a) coupling the sparker-generated gas bubble expansion and contraction to the rock, (b) the effects of fluid properties and dynamics, (c) linear and non-linear acoustics, and (d) imparted force directionality. After extensive seismic modeling, the design of high-efficiency sparkers, laboratory high frequency sparker testing, and field tests were performed at the University of Texas Devine seismic test site. The conclusion of the field test was that extremely high power levels would be required to have the range required for deep, 15,000+ ft, high-temperature, high-pressure (HTHP) wells. Thereafter, more modeling and laboratory testing led to the discovery of a method to control a sparker that could generate low frequencies required for deep wells. The low frequency sparker was successfully tested at the Department of Energy Rocky Mountain Oilfield Test Center (DOE RMOTC) field test site in Casper, Wyoming. An 8-in diameter by 26-ft long SeismicPULSER{trademark} drill string tool was designed and manufactured by TII. An APS Turbine Alternator powered the SeismicPULSER{trademark} to produce two Hz frequency peak signals repeated every 20 seconds. Since the ION Geophysical, Inc. (ION) seismic survey surface recording system was designed to detect a minimum downhole signal of three Hz, successful performance was confirmed with a 5.3 Hz recording with the pumps running. The two Hz signal generated by the sparker was modulated with the 3.3 Hz signal produced by the mud pumps to create an intense 5.3 Hz peak frequency signal. The low frequency sparker source is ultimately capable of generating selectable peak frequencies of 1 to 40 Hz with high-frequency spectra content to 10 kHz. The lower frequencies and, perhaps, low-frequency sweeps, are needed to achieve sufficient range and resolution for realtime imaging in deep (15,000 ft+), high-temperature (150 C) wells for (a) geosteering, (b) accurate seismic hole depth, (c) accurate pore pressure determinations ahead of the bit, (d) near wellbore diagnostics with a downhole receiver and wired drill pipe, and (e) reservoir model verification. Furthermore, the pressure of the sparker bubble will disintegrate rock resulting in an increased overall rates of penetration. Other applications for the SeismicPULSER{trademark} technology are to deploy a low-frequency source for greater range on a wireline for Reverse Vertical Seismic Profiling (RVSP) and Cross-Well Tomography. Commercialization of the technology is being undertaken by first contacting stakeholders to define the value proposition for rig site services utilizing SeismicPULSER{trademark} technologies. Stakeholders include national oil companies, independent oil companies, independents, service companies, and commercial investors. Service companies will introduce a new Drill Bit SWD service for deep HTHP wells. Collaboration will be encouraged between stakeholders in the form of joint industry projects to develop prototype tools and initial field trials. No barriers have been identified for developing, utilizing, and exploiting the low-frequency SeismicPULSER{trademark} source in a

  20. New drilling rigs

    SciTech Connect

    Tubb, M.

    1981-02-01

    Friede and Goldman Ltd. of New Orleans, Louisiana has a successful drilling rig, the L-780 jack-up series. The triangular-shaped drilling vessel measures 180 x 176 ft. and is equipped with three 352 ft legs including spud cans. It is designed to work in up to 250 ft waters and drill to 20,000 ft depths. The unit is scheduled to begin initial drilling operations in the Gulf of Mexico for Arco. Design features are included for the unit. Davie Shipbuilding Ltd. has entered the Mexican offshore market with the signing of a $40,000,000 Canadian contract for a jack-up to work in 300 ft water depths. Baker Marine Corporation has contracted with the People's Republic of China for construction of two self-elevating jack-ups. The units will be built for Magnum Marine, headquartered in Houston. Details for the two rigs are given. Santa Fe International Corporation has ordered a new jack-up rig to work initially in the Gulf of Suez. The newly ordered unit, Rig 136, will be the company's fourth offshore drilling rig now being built in the Far East. Temple Drilling Company has signed a construction contract with Bethlehem Steel for a jack-up to work in 200 ft water depths. Penrod Drilling Company has ordered two additional cantilever type jack-ups for Hitachi Shipbuilding and Engineering Co. Ltd. of Japan. Two semi-submersibles, capable of working in up to 2000 ft water depths, have been ordered by two Liberian companies. Details for these rigs are included. (DP)

  1. Design of a diesel exhaust-gas purification system for inert-gas drilling

    SciTech Connect

    Caskey, B.C.

    1982-01-01

    To combat the serious oxygen corrosion of drill pipe when a low density drilling fluid (air or mist) is used in geothermal drilling, a system has been designed that produces an inert gas (essentially nitrogen) to be substituted for air. The system fits on three flatbed trailers, is roadable and produces 2000 scfm of gas. The projected cost for gas is slightly less than $2.00 per thousand standard cubic feet.

  2. Drilling optimization: A new approach to optimize drilling parameters and improve drilling efficiency

    SciTech Connect

    Cunha, J.C.S.; Prado, M.G.; Bonet, L. [Petrobras, Rio de Janeiro (Brazil); [Univ. of Tulsa, OK (United States)

    1995-12-31

    In this work a study of minimization of drilling costs is presented and discussed. The drilling cost will be analyzed not for one single bit, as usual, but for the drilling operation of the entire well section from its initial to final depth. The costs that will be taken into account are those incurred during the drilling operation. Other related costs like casing, cement, logging, etc., will not be considered in the problem since these costs will occur independent of the way that the well is drilled. During the drilling operation two major costs will be studied, the drilling cost itself and the cost of tripping when changing bits. The main objective of this work is to find, for an entire drilling section of the well, the optimum drilling parameters for each bit, and the depth where each bit will be changed.

  3. Drilling on Autopilot

    NSDL National Science Digital Library

    Henry Bortman

    This magazine article features an interview with Mars Analog Research and Technology Experiment (MARTE) scientist Carol Stoker. In this final session of the four-part series, Stoker talks about MARTE's technology objective: developing a fully automated drilling and life-detection system. Her team is drilling into the pyrite subsurface of Spain's Rio Tinto in search for microbes existing in an iron-sulfur-based energy system, similar to that of Mars. She discuses the technical and monetary challenges of developing both the hardware and software for the first ever completely robotic system to do core drilling and sample analysis autonomously. The resource includes images from the Mars rover project, links to related web sites, and an MP3 Audio Machine text-to-speech option.

  4. Improved diamond coring bits developed for dry and chip-flush drilling

    NASA Technical Reports Server (NTRS)

    Decker, W. E.; Hampe, W. R.; Hampton, W. H.; Simon, A. B.

    1971-01-01

    Two rotary diamond bit designs, one operating with a chip-flushing fluid, the second including auger section to remove drilled chips, enhance usefulness of tool for exploratory and industrial core-drilling of hard, abrasive mineral deposits and structural masonry.

  5. Critique of Drilling Research

    SciTech Connect

    Hamblin, Jerry

    1992-03-24

    For a number of years the Department of Energy has been funding research to reduce the cost of drilling geothermal wells. Generally that research has been effective and helped to make geothermal energy economically attractive to developers. With the increased competition for the electrical market, geothermal energy needs every advantage it can acquire to allow it to continue as a viable force in the marketplace. In drilling related research, there is essentially continuous dialogue between industry and the national laboratories. Therefore, the projects presented in the Program Review are focused on subjects that were previously recommended or approved by industry.

  6. Deep Drilling at Sea

    NSDL National Science Digital Library

    Kate Ramsayer

    This Science News for Kids article provides an image-rich overview of a deep-sea drilling project off the coast of British Columbia. The article guides students through the exploration, explaining how deep sediment cores are taken, what researchers find in the cores, and details of what life is like on a research ship. It features links to an online poll, an opportunity for students to submit comments, a deep-sea drilling word find, and links to supplementary reading questions and related sites.

  7. Ocean drilling program: Recent results and future drilling plans

    Microsoft Academic Search

    P. D. Rabinowitz; T. J. G. Francis; J. G. Baldauf; J. F. Allan; E. A. Heise; J. C. Seymour

    1993-01-01

    The Ocean Drilling Program (ODP) has completed 48 internationally-staffed expeditions of scientific ocean drilling in search of answers relating to the evolution of passive and active continental margins, evolution of oceanic crust, origin and evolution of marine sedimentary sequences, and paleoceanography. During the past year of drilling operations, ODP expeditions cored Cretaceous reef-bearing guyots of the Western Pacific, with the

  8. Laser Oil and Gas Well Drilling Demonstration Videos

    DOE Data Explorer

    ANL's Laser Applications Laboratory and collaborators are examining the feasibility of adapting high-power laser technology to drilling for gas and oil. The initial phase is designed to establish a scientific basis for developing a commercial laser drilling system and determine the level of gas industry interest in pursuing future research. Using lasers to bore a hole offers an entirely new approach to mechanical drilling. The novel drilling system would transfer light energy from lasers on the surface, down a borehole by a fiber optic bundle, to a series of lenses that would direct the laser light to the rock face. Researchers believe that state-of-the-art lasers have the potential to penetrate rock many times faster than conventional boring technologies - a huge benefit in reducing the high costs of operating a drill rig. Because the laser head does not contact the rock, there is no need to stop drilling to replace a mechanical bit. Moreover, researchers believe that lasers have the ability to melt the rock in a way that creates a ceramic sheath in the wellbore, eliminating the expense of buying and setting steel well casing. A laser system could also contain a variety of downhole sensors, including visual imaging systems that could communicate with the surface through the fiber optic cabling. Earlier studies have been promising, but there is still much to learn. One of the primary objectives of the new study will be to obtain much more precise measurements of the energy requirements needed to transmit light from surface lasers down a borehole with enough power to bore through rocks as much as 20,000 feet or more below the surface. Another objective will be to determine if sending the laser light in sharp pulses, rather than as a continuous stream, could further increase the rate of rock penetration. A third aspect will be to determine if lasers can be used in the presence of drilling fluids. In most wells, thick fluids called "drilling muds" are injected into the borehole to wash out rock cuttings and keep water and other fluids from the underground formations from seeping into the well. The technical challenge will be to determine whether too much laser energy is expended to clear away the fluid where the drilling is occurring. (Copied with editing from http://www.ne.anl.gov/facilities/lal/laser_drilling.html). The demonstration videos, provided here in QuickTime format, are accompanied by patent documents and PDF reports that, together, provide an overall picture of this fascinating project.

  9. Modified Cobalt Drills With Oil Passages

    NASA Technical Reports Server (NTRS)

    Hutchison, E.; Richardson, D.

    1986-01-01

    Oil forced through drill shanks to lubricate cutting edges. Drill bits cooled and lubricated by oil forced through drill shanks and out holes adjacent to bits. This cooling technique increases drillbit life and allows increased drill feed rates.

  10. Managed pressure drilling techniques and tools 

    E-print Network

    Martin, Matthew Daniel

    2006-08-16

    The economics of drilling offshore wells is important as we drill more wells in deeper water. Drilling-related problems, including stuck pipe, lost circulation, and excessive mud cost, show the need for better drilling ...

  11. Combination drilling and skiving tool

    DOEpatents

    Stone, William J. (Kansas City, MO)

    1989-01-01

    A combination drilling and skiving tool including a longitudinally extending hollow skiving sleeve slidably and concentrically mounted on a right-handed twist drill. Dogs or pawls provided on the internal periphery of the skiving sleeve engage with the helical grooves of the drill. During a clockwise rotation of the tool, the drill moves downwardly and the sleeve translates upwardly, so that the drill performs a drilling operation on a workpiece. On the other hand, the drill moves upwardly and the sleeve translates downwardly, when the tool is rotated in a counter-clockwise direction, and the sleeve performs a skiving operation. The drilling and skiving operations are separate, independent and exclusive of each other.

  12. Geothermal Drilling and Completion Technology Development Program Annual Progress Report

    SciTech Connect

    Varnado, S. G.

    1981-03-01

    The high cost of drilling and completing geothermal wells is an impediment to the timely development of geothermal resources in the US. The Division of Geothermal Energy (DGE) of the Department of Energy (DOE) has initiated a development program aimed at reducing well costs through improvements in the technology used to drill and complete geothermal wells. Sandia National Laboratories (SNL) has been selected to manage this program for DOE/DGE. Based on analyses of existing well costs, cost reduction goals have been set for the program. These are to develop the technology required to reduce well costs by 25% by 1983 and by 50% by 1987. To meet these goals, technology development in a wide range of areas is required. The near-term goal will be approached by improvements in conventional, rotary drilling technology. The long-term goal will require the development of an advanced drilling and completion system. Currently, the program is emphasizing activities directed at the near-term cost reduction goal, but increased emphasis on advanced system development is anticipated as time progresses. The program is structured into six sub-elements: Drilling Hardware, Drilling Fluids, Completion Technology, Lost Circulation Control Methods, Advanced Drilling Systems, and Supporting Technology. Technology development in each of these areas is conducted primarily through contracts with private industries and universities. Some projects are conducted internally by Sandia. This report describes the program, status, and results of ongoing R and D within the program for the 1980 fiscal year.

  13. Logging while drilling application in Latin America and the Caribbean

    SciTech Connect

    Husband, F.J.; Palomo M., R.; Roca R., L.

    1994-12-31

    The commercial use of Logging While Drilling (LWD) technology in Latin America and the Caribbean has grown significantly in the last two years as national and international oil and gas companies implement more efficient systems to locate and extract hydrocarbons. This technology has been applied to optimize drilling projects as LWD measurements are now routinely used for improved log quality, geosteering into complex horizontal targets, insurance logging in difficult drilling environments, and where operating rig costs create a financial need. Case field applications are presented including drilling and logging depleted gas sands in high concentration LCM mud systems, 3-dimensional geosteering techniques, and time lapsed overlays for identification of moved fluids and wellbore stability. The examples and discussion that follow represent field experience utilizing Compensated Dual Resistivity (CDR) and Compensated Density Neutron (CDN) measurements to more efficiently find and produce oil and gas in Latin America.

  14. Drilling holes in tube sheets

    Microsoft Academic Search

    A. I. Elizarov

    1982-01-01

    Drilling holes in the tube sheets of shell-and-tube heat exhangers, condensers, and evaporators is one of the most laborious and low-production operations. This is primarily the result of the low life of drills. Experimental work and the experience of various plants has shown that to increase the life of standard high-speed steel spiral drills in drilling holes in stainless steels

  15. November 2002 OCEAN DRILLING PROGRAM

    E-print Network

    November 2002 OCEAN DRILLING PROGRAM LEG 208 SCIENTIFIC PROSPECTUS EARLY CENOZOIC EXTREME CLIMATES -------------------------------- Dr. Jack Baldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University Leg Project Manager and Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery

  16. November 2002 OCEAN DRILLING PROGRAM

    E-print Network

    November 2002 OCEAN DRILLING PROGRAM LEG 209 SCIENTIFIC PROSPECTUS DRILLING MANTLE PERIDOTITE ALONG 20036 USA -------------------------------- Dr. Jack Baldauf Deputy Director of Science Operations Ocean -------------------------------- Dr. D. Jay Miller Leg Project Manager and Staff Scientist Ocean Drilling Program Texas A&M University

  17. February 2002 OCEAN DRILLING PROGRAM

    E-print Network

    February 2002 OCEAN DRILLING PROGRAM LEG 204 SCIENTIFIC PROSPECTUS DRILLING GAS HYDRATES ON HYDRATE Services Wischhofstrasse 1-3 24148 Kiel Germany Dr. Anne Trehu College of Oceanic and Atmospheric Sciences -------------------------------- Dr. Jack Baldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University

  18. INTERNATIONAL CONTINENTAL SCIENTIFIC DRILLING PROGRAM

    E-print Network

    , Germany June 22, 2011 07-2011 Revised Workshop Proposal Oman Ophiolite Drilling Project, Workshop Proposal, Thank you very much for submitting a Workshop Proposal on the "Oman Ophiolite Drilling Project", which such as the contact to the Tibetan Ophiolite Drilling scientists, and for OSG support measures. I wish you successful

  19. The rock melting approach to drilling

    SciTech Connect

    Cort, G.E.; Goff, S.J.; Rowley, J.C.; Neudecker, J.W. Jr.; Dreesen, D.S.; Winchester, W.

    1993-09-01

    During the early and mid-1970`s the Los Alamos National Laboratory demonstrated practical applications of drilling and coring using an electrically-heated graphite, tungsten, or molybdenum penetrator that melts a hole as it is slowly pushed through the rock or soil. The molten material consolidates into a rugged glass lining that prevents hole collapse; minimizes the potential for cross-flow, lost circulation, or the release of hazardous materials without casing operations; and produces no cuttings in porous or low density (<1.7 g/cc) formations. Because there are no drilling fluids required, the rock melting approach reduces waste handling, treatment and disposal. Drilling by rock melting has been demonstrated to depths up to 30 m in caliche, clay, alluvium, cobbles, sand, basalt, granite, and other materials. Penetrating large cobbles without debris removal was achieved by thermal stress fracturing and lateral extrusion of portions of the rock melt into the resulting cracks. Both horizontal and vertical holes in a variety of diameters were drilled in these materials using modular, self-contained field units that operate in remote areas. Because the penetrator does not need to rotate, steering by several simple approaches is considered quite feasible. Melting is ideal for obtaining core samples in alluvium and other poorly consolidated soils since the formed-in-place glass liner stabilizes the hole, encapsulates volatile or hazardous material, and recovers an undisturbed core. Because of the relatively low thermal conductivity of rock and soil materials, the heat-affected zone beyond the melt layer is very small, <1 inch thick. Los Alamos has begun to update the technology and this paper will report on the current status of applications and designs for improved drills.

  20. Foam drilling simulator 

    E-print Network

    Paknejad, Amir Saman

    2007-04-25

    ....................................................17 Pressure Drop Across Bit Nozzles..............................................18 Heat Capacity..............................................................................19 III FOAM DRILLING SIMULATOR... , ...............................................................................................................(2.25) where; =b Pressure drop across the bit Pbh = Bottom-hole pressure nn = Nozzle velocity M = Gas molecular weight mg = Mass of gas ml = Mass of liquid Heat Capacity Like any two-phase mixture, heat capacity of foam is the average...

  1. Drill Press Work Sample.

    ERIC Educational Resources Information Center

    Shawsheen Valley Regional Vocational-Technical High School, Billerica, MA.

    This manual contains a work sample intended to assess a handicapped student's interest in and to screen interested students into a training program in basic machine shop I. (The course is based on the entry level of the drill press operator.) Section 1 describes the assessment, correlates the work performed and worker traits required for…

  2. Proposed Drill Sites

    DOE Data Explorer

    Lane, Michael

    Proposed drill sites for intermediate depth temperature gradient holes and/or deep resource confirmation wells. Temperature gradient contours based on shallow TG program and faults interpreted from seismic reflection survey are shown, as are two faults interpreted by seismic contractor Optim but not by Oski Energy, LLC.

  3. Ocean Drilling Simulation Activity.

    ERIC Educational Resources Information Center

    Telese, James A.; Jordan, Kathy

    The Ocean Drilling Project brings together scientists and governments from 20 countries to explore the earth's structure and history as it is revealed beneath the oceans' basins. Scientific expeditions examine rock and sediment cores obtained from the ocean floor to learn about the earth's basic processes. The series of activities in this…

  4. DRILLING MACHINES GENERAL INFORMATION

    E-print Network

    Gellman, Andrew J.

    hand-held power drills to bench mounted and finally floor-mounted models. They can perform operations tool is withdrawn from 4-2 the work. Feed pressure applied to the sleeve by hand or power causes. Wipe all spindles and sleeves free of grit to a

  5. Drill sergeant selection model

    Microsoft Academic Search

    T. Barker; S. Gouthro; J. Jarvis; R. Markham; J. Halstead

    2008-01-01

    This research aims to strengthen the current utility of the Warrior Attributes Inventory (WAI), formerly known as the Non Commissioned Officer Leadership Skills Inventory (NLSI). The end state of the research is to create a model that will accurately predict potential drill sergeant performance based upon WAI scores and biographical data. The research leverages statistical learning methods and the United

  6. Deep-Time drilling in the Australian Archean: the Agouron Institute geobiological drilling project. (Invited)

    NASA Astrophysics Data System (ADS)

    Buick, R.

    2010-12-01

    The Agouron Institute has sponsored deep-time drilling across the South African Archean-Proterozoic boundary, investigating the rise of oxygen over an onshore-offshore environmental transect. It is now supporting a drilling program in the Australian Archean of the Pilbara Craton, addressing a similar theme but with the added goal of resolving controversy over the age and origin of hydrocarbon biomarker molecules in ancient kerogenous shales. As these have been claimed to provide evidence for the evolution of oxygenic photosynthesis long before the rise of atmospheric oxygen to persistently high levels during the ~2.3 Ga “Great Oxidation Event”, their syngenesis with their host shales is thus of critical importance for the interpretation of Earth’s early oxygenation history. During the first drilling season, 3 holes were drilled using techniques and equipment to minimize organic geochemical contamination (new drill-string components cleaned before drilling potentially biomarker-bearing rocks, pre-contamination of drilling fluid with a synthetic organic compound of similar geochemical characteristics to biomarkers, sterile cutting and storage of samples immediately upon retrieval from the core-barrel). The initial hole was a blank control for organic geochemistry, drilled into rocks too metamorphosed to retain biomarker molecules. These rocks, cherts, carbonates and pelites of the 3.52 Ga Coucal Formation, Coonterunah Group, have been metamorphosed to upper greenschist facies at temperatures near 500°C and so should have had any ancient soluble hydrocarbons destroyed. However, because they contain both carbonate and organic carbon, these rocks can instead provide isotopic information about the earliest evolution of biological metabolism as they possess residues of both the reactant and product sides of the carbon-fixation reaction. The second hole sampled an on-shore section of carbonates and kerogenous shales in the ~2.65 Ga Carawine Dolomite and Lewin Shale of the Hamersley Group near Yilgalong Creek. This location had been previously drilled by a mining company in the 1980’s and the core provided the highest biomarker yields of any Archean rocks thus far sampled. As it has been suggested that these biomarkers are non-indigenous contaminants, one possibility is that they were introduced into the drill-core at some time between drilling and sampling, so this hole tests that hypothesis. If biomarker concentrations and ratios differ significantly between the two adjacent holes with differing exposures to post-drilling contaminants, then clearly contamination has affected one or other of the cores. The third hole sampled an off-shore equivalent, through banded irons and kerogenous shales of the ~2.65 Ga Marra Mamba and Jeerinah Formations of the Hamersley Group near Cowcumba Creek. Another opportunity for contamination may arise during post-depositional but pre-drilling hydrocarbon migration, when biomarkers can potentially be introduced into previously barren rocks by younger oils, so this hole tests that possibility. As it was drilled through the same stratigraphic interval and structural domain as the second hole but in a different environment, biomarker ratios should be similar if contaminated but different if indigenous.

  7. Mixer for drill cuttings and drilling mud on a drilling location

    SciTech Connect

    van der Laan, J. G. J.; Entrop, W.

    1985-05-14

    A device for mixing of liquids and particulate solids, such as for instance a drilling liquid and drill cuttings on a drilling location. This drilling location can be a deep well drilled for gas and/or oil by means of a drilling tower on-or off-shore. The invention provides an elongated, rectangular open mixing tank on which a series of replacable agitating units having their axes in one vertical plane is mounted. The agitating devices each comprise a unit having a rotatably driven head carrying two support arms of unequal length which each support a mixing screw projecting into the mixture of liquids and particulate solids. This arrangement provides a thorough mixture of the drilling liquid, having a high viscosity and high specific gravity, with the drill cuttings frequently comprising heavy clay and/or rock particles.

  8. Mars Science Laboratory Drill

    NASA Technical Reports Server (NTRS)

    Okon, Avi B.; Brown, Kyle M.; McGrath, Paul L.; Klein, Kerry J.; Cady, Ian W.; Lin, Justin Y.; Ramirez, Frank E.; Haberland, Matt

    2012-01-01

    This drill (see Figure 1) is the primary sample acquisition element of the Mars Science Laboratory (MSL) that collects powdered samples from various types of rock (from clays to massive basalts) at depths up to 50 mm below the surface. A rotary-percussive sample acquisition device was developed with an emphasis on toughness and robustness to handle the harsh environment on Mars. It is the first rover-based sample acquisition device to be flight-qualified (see Figure 2). This drill features an autonomous tool change-out on a mobile robot, and novel voice-coil-based percussion. The drill comprises seven subelements. Starting at the end of the drill, there is a bit assembly that cuts the rock and collects the sample. Supporting the bit is a subassembly comprising a chuck mechanism to engage and release the new and worn bits, respectively, and a spindle mechanism to rotate the bit. Just aft of that is a percussion mechanism, which generates hammer blows to break the rock and create the dynamic environment used to flow the powdered sample. These components are mounted to a translation mechanism, which provides linear motion and senses weight-on-bit with a force sensor. There is a passive-contact sensor/stabilizer mechanism that secures the drill fs position on the rock surface, and flex harness management hardware to provide the power and signals to the translating components. The drill housing serves as the primary structure of the turret, to which the additional tools and instruments are attached. The drill bit assembly (DBA) is a passive device that is rotated and hammered in order to cut rock (i.e. science targets) and collect the cuttings (powder) in a sample chamber until ready for transfer to the CHIMRA (Collection and Handling for Interior Martian Rock Analysis). The DBA consists of a 5/8-in. (.1.6- cm) commercial hammer drill bit whose shank has been turned down and machined with deep flutes designed for aggressive cutting removal. Surrounding the shank of the bit is a thick-walled maraging steel collection tube allowing the powdered sample to be augured up the hole into the sample chamber. For robustness, the wall thickness of the DBA was maximized while still ensuring effective sample collection. There are four recesses in the bit tube that are used to retain the fresh bits in their bit box. The rotating bit is supported by a back-to-back duplex bearing pair within a housing that is connected to the outer DBA housing by two titanium diaphragms. The only bearings on the drill in the sample flow are protected by a spring-energized seal, and an integrated shield that diverts the ingested powdered sample from the moving interface. The DBA diaphragms provide radial constraint of the rotating bit and form the sample chambers. Between the diaphragms there is a sample exit tube from which the sample is transferred to the CHIMRA. To ensure that the entire collected sample is retained, no matter the orientation of the drill with respect to gravity during sampling, the pass-through from the forward to the aft chamber resides opposite to the exit tube.

  9. U. S. Geological Survey core drilling on the Atlantic shelf

    Microsoft Academic Search

    J. C. Hathaway; C. W. Poag; P. C. Valentine; R. E. Miller; D. M. Schultz; F. T. Manheim; F. A. Kohout; M. H. Bothner; D. A. Sangrey

    1979-01-01

    The first broad program of scientific shallow drilling on the US Atlantic continental shelf has delineated rocks of Pleistocene to Late Cretaceous age, including phosphoritic Miocene strata, widespread Eocene carbonate deposits that serve as reflective seismic markers, and several regional unconformities. Two sites, off Maryland and New Jersey, showed light hydrocarbon gases having affinity to mature petroleum. Pore fluid studies

  10. A Model for Laser Hole Drilling in Metals

    Microsoft Academic Search

    Ram K. Ganesh; Wallace W. Bowley; Robert R. Bellantone; Yukap Hahn

    1996-01-01

    A direct computer simulation technique is developed to analyze quantitatively the influence of the fluid flow and heat transfer in the transient development of a laser drilled hole in a turbine airfoil material, where the material removal is effected by vaporization and melt ejection. The coupled conduction heat transfer in the solid and the advection-diffusion heat transfer in the liquid

  11. Time Dependent Fluids

    ERIC Educational Resources Information Center

    Collyer, A. A.

    1974-01-01

    Discusses the flow characteristics of thixotropic and negative thixotropic fluids; various theories underlying the thixotropic behavior; and thixotropic phenomena exhibited in drilling muds, commercial paints, pastes, and greases. Inconsistencies in the terminology used to label time dependent effects are revealed. (CC)

  12. Cost effectiveness of sonic drilling

    SciTech Connect

    Masten, D.; Booth, S.R.

    1996-03-01

    Sonic drilling (combination of mechanical vibrations and rotary power) is an innovative environmental technology being developed in cooperation with DOE`s Arid-Site Volatile Organic Compounds Integrated Demonstration at Hanford and the Mixed Waste Landfill Integrated Demonstration at Sandia. This report studies the cost effectiveness of sonic drilling compared with cable-tool and mud rotary drilling. Benefit of sonic drilling is its ability to drill in all types of formations without introducing a circulating medium, thus producing little secondary waste at hazardous sites. Progress has been made in addressing the early problems of failures and downtime.

  13. An evaluation of flowmeters for the detection of kicks and lost circulation during drilling

    SciTech Connect

    Schafer, D.M.; Loeppke, G.E.; Glowka, D.A.; Scott, D.D. (Sandia National Labs., Albuquerque, NM (United States)); Wright, K.E. (Ktech Corp., Albuquerque, NM (United States))

    1991-01-01

    An independent evaluation of current industry standard and state-of-the-art drilling fluid inflow and outflow meters was conducted during the drilling of a geothermal exploratory well. Four different types of fluid inflow meters and three different types of fluid outflow meters were tested and evaluated during actual drilling operations. The tested drilling fluid inflow meters included conventional pump stroke counters, rotary pump speed counters, magnetic flow meters, and a Doppler ultrasonic flow meter. On the return flow line, a standard paddle meter, an acoustic level meter, and a prototype rolling float meter were evaluated to measure drilling fluid outflow rates. The prototype outflow meter utilizes a rolling float which rides on the surface of the flow thereby measuring the fluid height in the pipe. Both the prototype meter and the conventional paddle meter were also extensively tested under a variety of drilling conditions in a full-scale laboratory test facility. The meters were evaluated and compared on the basis of reliability and accuracy, and the results are presented in the paper.

  14. Well completion technology. Multiuse polymer protects injection well during drilling, underreaming, gravel packing

    SciTech Connect

    Davis, K.E.; Jarrell, M.D.

    1983-12-12

    Fluids for drilling, gravel-packing, and completion were optimized for an expensive injection well. Successful engineering gave maximum injection rates and no skin damage, while accomplishing all the fundamental drilling and suspension functions of fluids. Formation protection was critical. The approximately $5-million well was planned for chemical waste disposal, and plant capacity is limited by injectivity. This work describes the fluid, hardware, and techniques used. The 3 distinct fluids were variations on the same polymer-based system. Results of tests showed that Kelzan XCD Polymer, a dispersible form of xanthan gum, had the most applicable overall properties.

  15. The effect of diagenesis and fluid migration on rare earth element distribution in pore fluids of the northern Cascadia accretionary margin

    Microsoft Academic Search

    Ji-Hoon Kim; Marta E. Torres; Brian A. Haley; Miriam Kastner; John W. Pohlman; Michael Riedel; Young-Joo Lee

    Analytical challenges in obtaining high quality measurements of rare earth elements (REEs) from small pore fluid volumes have limited the application of REEs as deep fluid geochemical tracers. Using a recently developed analytical technique, we analyzed REEs from pore fluids collected from Sites U1325 and U1329, drilled on the northern Cascadia margin during the Integrated Ocean Drilling Program (IODP) Expedition

  16. Development of drilling foams for geothermal applications

    SciTech Connect

    McDonald, W.J.; Remont, L.J.; Rehm, W.A.; Chenevert, M.E.

    1980-01-01

    The use of foam drilling fluids in geothermal applications is addressed. A description of foams - what they are, how they are used, their properties, equipment required to use them, the advantages and disadvantages of foams, etc. - is presented. Geothermal applications are discussed. Results of industry interviews presented indicate significant potential for foams, but also indicate significant technical problems to be solved to achieve this potential. Testing procedures and results of tests on representative foams provide a basis for work to develop high-temperature foams.

  17. Effect of a water-based drilling waste on receiving soil properties and plants growth.

    PubMed

    Saint-Fort, Roger; Ashtani, Sahar

    2014-01-01

    This investigation was undertaken to determine the relative effects of recommended land spraying while drilling (LWD) loading rate application for a source of water-based drilling waste material on selected soil properties and phytotoxicity. Drilling waste material was obtained from a well where a nitrate gypsum water based product was used to formulate the drilling fluid. The fluid and associated drill cuttings were used as the drilling waste source to conduct the experiment. The study was carried out in triplicate and involved five plant species, four drilling waste loading rates and a representative agricultural soil type in Alberta. Plant growth was monitored for a period of ten days. Drilling waste applied at 10 times above the recommended loading rate improved the growth and germination rate of all plants excluding radish. Loading rates in excess of 40 and 50 times had a deleterious effect on radish, corn and oat but not on alfalfa and barley. Germination rate decreased as waste loading rate increased. Effects on soil physical and chemical properties were more pronounced at the 40 and 50 times exceeding recommended loading rate. Significant changes in soil parameters occurred at the higher rates in terms of increase in soil porosity, pH, EC, hydraulic conductivity, SAR and textural classification. This study indicates that the applications of this type of water based drill cutting if executed at an optimal loading rate, may improve soil quality and results in better plant growth. PMID:24117079

  18. Horizontal drilling spurs optimism

    SciTech Connect

    Crouse, P.C. (Philip C. Crouse and Associates, Inc., Horizontal Advisors Unit, Dallas, TX (US))

    1991-02-01

    1990 proved to be an exciting year for horizontal wells. This budding procedure appears to be heading for the mainstream oil and gas market, because it can more efficiently recover hydrocarbons from many reservoirs throughout the world. This paper reports on an estimated 1,000 wells that were drilled horizontally (all laterals) in 1990, with the Austin Chalk formation of Texas accounting for about 65% of all world activity. The Bakken Shale play in Montana and North Dakota proved to be the second most active area, with an estimated 90 wells drilled. Many operators in this play have indicated the bloom may be off the Bakken because of poor results outside the nose of the formation, further complicated by some of the harshest rock, reservoir and completion problems posed to horizontal technology.

  19. DEVELOPMENT AND TESTING OF UNDERBALANCED DRILLING PRODUCTS. Final Report, Oct 1995 - July 2001

    SciTech Connect

    William C. Maurer; William J. McDonald; Thomas E. Williams; John H. Cohen

    2001-07-01

    Underbalanced drilling is experiencing growth at a rate that rivals that of horizontal drilling in the mid-1980s and coiled-tubing drilling in the 1990s. Problems remain, however, for applying underbalanced drilling in a wider range of geological settings and drilling environments. This report addresses developments under this DOE project to develop products aimed at overcoming these problems. During Phase I of the DOE project, market analyses showed that up to 12,000 wells per year (i.e., 30% of all wells) will be drilled underbalanced in the U.S.A. within the next ten years. A user-friendly foam fluid hydraulics model (FOAM) was developed for a PC Windows environment during Phase I. FOAM predicts circulating pressures and flow characteristics of foam fluids used in underbalanced drilling operations. FOAM is based on the best available mathematical models, and was validated through comparison to existing models, laboratory test data and field data. This model does not handle two-phase flow or air and mist drilling where the foam quality is above 0.97. This FOAM model was greatly expanded during Phase II including adding an improved foam rheological model and a ''matching'' feature that allows the model to be field calibrated. During Phase I, a lightweight drilling fluid was developed that uses hollow glass spheres (HGS) to reduce the density of the mud to less than that of water. HGS fluids have several advantages over aerated fluids, including they are incompressible, they reduce corrosion and vibration problems, they allow the use of mud-pulse MWD tools, and they eliminate high compressor and nitrogen costs. Phase II tests showed that HGS significantly reduce formation damage with water-based drilling and completion fluids and thereby potentially can increase oil and gas production in wells drilled with water-based fluids. Extensive rheological testing was conducted with HGS drilling and completion fluids during Phase II. These tests showed that the HGS fluids act similarly to conventional fluids and that they have potential application in many areas, including underbalanced drilling, completions, and riserless drilling. Early field tests under this project are encouraging. These led to limited tests by industry (which are also described). Further field tests and cost analyses are needed to demonstrate the viability of HGS fluids in different applications. Once their effectiveness is demonstrated, they should find widespread application and should significantly reduce drilling costs and increase oil and gas production rates. A number of important oilfield applications for HGS outside of Underbalanced Drilling were identified. One of these--Dual Gradient Drilling (DGD) for deepwater exploration and development--is very promising. Investigative work on DGD under the project is reported, along with definition of a large joint-industry project resulting from the work. Other innovative products/applications are highlighted in the report including the use of HGS as a cement additive.

  20. Aerodynamic window for high precision laser drilling

    NASA Astrophysics Data System (ADS)

    Sommer, Steffen; Dausinger, Friedrich; Berger, Peter; Hügel, Helmuth

    2007-05-01

    High precision laser drilling is getting more and more interesting for industry. Main applications for such holes are vaporising and injection nozzles. To enhance quality, the energy deposition has to be accurately defined by reducing the pulse duration and thereby reducing the amount of disturbing melting layer. In addition, an appropriate processing technology, for example the helical drilling, yields holes in steel at 1 mm thickness and diameters about 100 ?m with correct roundness and thin recast layers. However, the processing times are still not short enough for industrial use. Experiments have shown that the reduction of the atmospheric pressure down to 100 hPa enhances the achievable quality and efficiency, but the use of vacuum chambers in industrial processes is normally quite slow and thus expensive. The possibility of a very fast evacuation is given by the use of an aerodynamic window, which produces the pressure reduction by virtue of its fluid dynamic features. This element, based on a potential vortex, was developed and patented as out-coupling window for high power CO II lasers by IFSW 1, 2, 3. It has excellent tightness and transmission properties, and a beam deflection is not detectable. The working medium is compressed air, only. For the use as vacuum element for laser drilling, several geometrical modifications had to be realized. The prototype is small enough to be integrated in a micromachining station and has a low gas flow. During the laser pulse, which is focussed through the potential flow, a very high fluence is reached, but the measurements have not shown any beam deflection or focal shifting. The evacuation time is below 300 ms so that material treatment with changing ambient pressure is possible, too. Experimental results have proven the positive effect of the reduced ambient pressure on the drilling process for the regime of nano- and picosecond laser pulses. Plasma effects are reduced and, because of the less absorption, the drilling velocity is increased and widening effects are decreased. So the process is more efficient and precise. Furthermore, the necessary pulse energy for the drilling of a certain material thickness is reduced and so laser power can be saved.

  1. Alterations in bottom sediment physical and chemical characteristics at the Terra Nova offshore oil development over ten years of drilling on the grand banks of Newfoundland, Canada

    NASA Astrophysics Data System (ADS)

    DeBlois, Elisabeth M.; Paine, Michael D.; Kilgour, Bruce W.; Tracy, Ellen; Crowley, Roger D.; Williams, Urban P.; Janes, G. Gregory

    2014-12-01

    This paper describes sediment composition at the Terra Nova offshore oil development. The Terra Nova Field is located on the Grand Banks approximately 350 km southeast of Newfoundland, Canada, at an approximate water depth of 100 m. Surface sediment samples (upper 3 cm) were collected for chemical and particle size analyses at the site pre-development (1997) and in 2000-2002, 2004, 2006, 2008 and 2010. Approximately 50 stations have been sampled in each program year, with stations extending from less than 1 km to a maximum of 20 km from source (drill centres) along five gradients, extending to the southeast, southwest, northeast, northwest and east of Terra Nova. Results show that Terra Nova sediments were contaminated with >C10-C21 hydrocarbons and barium-the two main constituents of synthetic-based drilling muds used at the site. Highest levels of contamination occurred within 1 to 2 km from source, consistent with predictions from drill cuttings dispersion modelling. The strength of distance gradients for >C10-C21 hydrocarbons and barium, and overall levels, generally increased as drilling progressed but decreased from 2006 to 2010, coincident with a reduction in drilling. As seen at other offshore oil development sites, metals other than barium, sulphur and sulphide levels were elevated and sediment fines content was higher in the immediate vicinity (less than 0.5 km) of drill centres in some sampling years; but there was no strong evidence of project-related alterations of these variables. Overall, sediment contamination at Terra Nova was spatially limited and only the two major constituents of synthetic-based drilling muds used at the site, >C10-C21 hydrocarbons and barium, showed clear evidence of project-related alternations.

  2. Apparatus in a drill string

    DOEpatents

    Hall, David R. (Provo, UT); Dahlgren, Scott (Alpine, UT); Hall, Jr., Tracy H. (Provo, UT); Fox, Joe (Lehi, UT); Pixton, David S. (Provo, UT)

    2007-07-17

    An apparatus in a drill string comprises an internally upset drill pipe. The drill pipe comprises a first end, a second end, and an elongate tube intermediate the first and second ends. The elongate tube and the ends comprising a continuous an inside surface with a plurality of diameters. A conformable spirally welded metal tube is disposed within the drill pipe intermediate the ends thereof and terminating adjacent to the ends of the drill pipe. The conformable metal tube substantially conforms to the continuous inside surface of the metal tube. The metal tube may comprise a non-uniform section which is expanded to conform to the inside surface of the drill pipe. The non-uniform section may comprise protrusions selected from the group consisting of convolutions, corrugations, flutes, and dimples. The non-uniform section extends generally longitudinally along the length of the tube.

  3. Hematite adds weight to fluid additive controversy

    SciTech Connect

    Malachosky, E.

    1986-07-01

    The controversy over the use of various iron oxides as weight material in drilling fluids has raged for years. Different forms of iron oxide had been employed prior to and during World War II when barite was considered a compound essential to the U.S. war effort and wartime economy. After the war when the government relaxed its requirements, barite again became the weighting material of choice for cements and drilling fluids.

  4. Geothermal corehole drilling and operations, Platanares, Honduras, Central America

    SciTech Connect

    Goff, S.; Rufenacht, H.D.; Laughlin, A.W.; Adams, A.; Planner, H.; Ramos, N.

    1987-01-01

    Two slim exploration coreholes to depths of 650 m and 428 m, respectively, have been completed at the Platanares geothermal site, Honduras, Central America. A third corehole is now being drilled. These boreholes have provided information on the stratigraphy, temperature variation with depth, nature and compositions of fluids, fracturing, permeability, and hydrothermal alterations associated with the geothermal reservoir. Eruptions of hot water occurred during the drilling of both the first and third boreholes. Recovery of >98% core has been obtained even under difficult superheated conditions.

  5. MWD aids vital drilling decisions

    SciTech Connect

    Fontenot, J.E.; Rao, M.V.

    1988-03-14

    Measurement-While-Drilling (MWD) sensors can supply much of the critical downhole information needed in a systems approach to improving drilling efficiency. The author looks at some areas where MWD information has helped to improve drilling efficiency. To date, most use of MWD has been for directional survey, pressure prediction, and formation evaluation. As MWD systems become more reliable and cost effective, their applications will expand.

  6. Attenuation of sound waves in drill strings

    Microsoft Academic Search

    Douglas S. Drumheller

    1993-01-01

    During drilling of deep wells, digital data are often transmitted from sensors located near the drill bit to the surface. Development of a new communication system with increased data capacity is of paramount importance to the drilling industry. Since steel drill strings are used, transmission of these data by elastic carrier waves traveling within the drill pipe is possible, but

  7. How to drill horizontal sections faster

    Microsoft Academic Search

    Chaffin

    1991-01-01

    This paper reports that fewer trips, reduced slide time and lower drag during sliding have resulted from the application of downhole-adjustable stabilizers to horizontal drilling. Faster drilling times mean lower measurement while drilling (MWD) cost, and less wear on downhole equipment, motors and bits. These advantages combined with reduced drilling shocks have increased drilling rates and efficiency. Applying existing technology

  8. OCEAN DRILLING PROGRAM LEG 109 PRELIMINARY REPORT

    E-print Network

    OCEAN DRILLING PROGRAM LEG 109 PRELIMINARY REPORT BARE ROCK DRILLING IN THE MID-ATLANTIC RIDGE RIFT 109 Ocean Drilling Program Texas A & M University College Station, TX 77843-3469 Philip D. Rabinowitz Director Ocean Drilling Program Robert B. Kidd Manager of Science Operations Ocean Drilling Program Louis E

  9. Liner and drill pipe assembly

    SciTech Connect

    Lindsey, H.E.; Cole, P.W.

    1990-02-06

    This patent describes a method of cementing a linear in a well bore. It comprises: making up sections of pipe to form a liner disposed in a well bore to a desired length of liner, supporting the desired length of liner at the earth's surface while making up sections of drill pipe to form a desired string of drill pip co-axially disposed within the desired length of liner where the desired string of drill pipe has a polished mandrel and a sealing bore receptacle at its lower end when the polished mandrel is in position for sealing reception in the sealing bore receptacle, attaching a setting tool assembly to the desired string of drill pipe and attaching a liner hanger assembly with liner hanger slips to the desired length of liner; releasing the liner at the earth's surface and making up a supporting string of drill pipe attached to the setting tool assembly for lowering the co-axially disposed (telescoped) desired length of liner and string of drill pipe through the well bore hanging the liner in the well bore with liner hanger slips; pumping a volume of cement slurry through the supporting string of drill pipe; and upon the trailing end of the volume of cement slurry reaching the lower end of the desired string of drill pipe, opening the interior of the desired string of drill pipe to the interior of the liner at a location above the sealing bore receptacle.

  10. Lunar drill and test apparatus

    NASA Technical Reports Server (NTRS)

    Norrington, David W.; Ardoin, Didier C.; Alexander, Stephen G.; Rowland, Philip N.; Vastakis, Frank N.; Linsey, Steven L.

    1988-01-01

    The design of an experimental lunar drill and a facility to test the drill under simulated lunar conditions is described. The drill utilizes a polycrystalline diamond compact drag bit and an auger to mechanically remove cuttings from the hole. The drill will be tested in a vacuum chamber and powered through a vacuum seal by a drive mechanism located above the chamber. A general description of the design is provided followed by a detailed description and analysis of each component. Recommendations for the further development of the design are included.

  11. Comparative toxicity of offshore and oil-added drilling muds to larvae of the grass shrimp Palaemonetes intermedius

    Microsoft Academic Search

    Philip J. Conklin; K. Ranga Rao

    1984-01-01

    Offshore drilling fluids (muds) varied widely in their toxicity to grass shrimp (Palaemonetes intermedius) larvae. The 96-hr LC50s for the eleven drilling muds tested ranged from 142 to >100,000 ppm (µl\\/L). There was a significant correlation between oil content of the drilling muds and their toxicity. Furthermore, addition of diesel oil (No. 2 fuel oil) or mineral oil to an

  12. [Branched horizontal well drilling

    SciTech Connect

    Grigoryan, A.M.

    1993-05-01

    In the former USSR, invented the technology of drilling and brought the industrial level a new type of oil wells - Grigoryan Branched-Horizontal wells. Tens of experimental wells had been drilled and successfully operated for a long period of time. The technology itself is unique, it was developed in isolation from the West and has left far behind all known methods by its effectiveness and technical characteristics. A single hole horizontal drilling which is being now applied all around the world is a small part of this method. A branched well has several additional holes with their branches. Such well is incomparably more effective than single horizontal hole as the branches penetrate in all directions the whole mass of productive formation by their canals free for oil inflow from distant zones, often isolated. In modern application this method enables to get wells with up to 20 times higher production rates and simultaneously 5 times less oil production costs. In order to commercialize technology a ``Grigoryan Branched-Horizontal wells Co.`` is being established for the development of oil fields, on ownership, lease or contractor basis. The Branched-Horizontal wells are especially effective in high thickness oil reservoirs with highly irregular porosity and rock permeability where the percentage of oil recovery is low while the potential reserves are very large. If in such a field oil Production of conventional well is only 10--20 ton (60--180 barrels) per day, one Branched-Horizontal well will produce an additional 10 million dollars worth of oil even during the first year of operation. This is the oil extracted from the bowels of the earth above the capacity of ordinary wells and inaccessible for them. Taking into consideration the fact that on average, only 20% of natural resources are being extracted around the world, the main advantage of this method is in doubling the recoverable reserves thus moving far ahead the predicted exhaustion of fossil hydrocarbons.

  13. [Branched horizontal well drilling

    SciTech Connect

    Grigoryan, A.M.

    1993-01-01

    In the former USSR, invented the technology of drilling and brought the industrial level a new type of oil wells - Grigoryan Branched-Horizontal wells. Tens of experimental wells had been drilled and successfully operated for a long period of time. The technology itself is unique, it was developed in isolation from the West and has left far behind all known methods by its effectiveness and technical characteristics. A single hole horizontal drilling which is being now applied all around the world is a small part of this method. A branched well has several additional holes with their branches. Such well is incomparably more effective than single horizontal hole as the branches penetrate in all directions the whole mass of productive formation by their canals free for oil inflow from distant zones, often isolated. In modern application this method enables to get wells with up to 20 times higher production rates and simultaneously 5 times less oil production costs. In order to commercialize technology a Grigoryan Branched-Horizontal wells Co.'' is being established for the development of oil fields, on ownership, lease or contractor basis. The Branched-Horizontal wells are especially effective in high thickness oil reservoirs with highly irregular porosity and rock permeability where the percentage of oil recovery is low while the potential reserves are very large. If in such a field oil Production of conventional well is only 10--20 ton (60--180 barrels) per day, one Branched-Horizontal well will produce an additional 10 million dollars worth of oil even during the first year of operation. This is the oil extracted from the bowels of the earth above the capacity of ordinary wells and inaccessible for them. Taking into consideration the fact that on average, only 20% of natural resources are being extracted around the world, the main advantage of this method is in doubling the recoverable reserves thus moving far ahead the predicted exhaustion of fossil hydrocarbons.

  14. An innovative drilling system

    SciTech Connect

    Nees, J.; Dickinson, E.; Dickinson, W.; Dykstra, H.

    1991-05-01

    The principal project objectives were the following: To demonstrate the capability of the Ultrashort Radius Radial System to drill and complete multiple horizontal radials in a heavy oil formation which had a production history of thermal operations. To study the effects that horizontal radials have on steam placement at specific elevations and on reducing gravity override. To demonstrate that horizontal radials could be utilized for cyclic production, i.e. for purposes of oil production as well as for steam injection. Each of these objectives was successfully achieved in the project. Early production results indicate that radials positively influenced cyclic performance. This report documents those results. 15 refs., 29 figs., 1 tab.

  15. Computer aided drill emulator 

    E-print Network

    Galvin, Daniel Lisenbee

    1972-01-01

    , but it holds for block formation bands also, For the block formation style bands much practice time could be saved if details of the drill could be simulated to provide informa- tion on timing, music coordination, and visual effect. Present charting methods... the director could see that a certain sequence of maneuvers could be performed. He would have some idea of the visual effect provided by the execution of those commands. At the same time precise timings could be available to him. The d1rector would thus...

  16. Cranial Drilling Tool with Retracting Drill Bit Upon Skull Penetration

    E-print Network

    Cranial Drilling Tool with Retracting Drill Bit Upon Skull Penetration Paul Loschak1 , Kechao Xiao1, Harvard University, Boston, MA 3 Beth Israel Deaconess Medical Center 1 Background Penetrating the skull as a injury [1]. The risk of pressure induced damage can be reduced by penetrating the skull with a small

  17. A review of the current options for the treatment and safe disposal of drill cuttings.

    PubMed

    Ball, Andrew S; Stewart, Richard J; Schliephake, Kirsten

    2012-05-01

    Drilling for the exploration and extraction of oil requires the use of drilling fluids which are continuously pumped down and returned carrying the rock phase that is extracted from the well. The potential environmental impacts of contaminated fluids from drilling operations have attracted increasing community awareness and scrutiny. This review article highlights current advances in the treatment of drill cuttings and compares the technologies in terms of cost, time and space requirements. Traditionally, a range of non-biological methods have been employed for the disposal of drill cuttings including burial pits, landfills and re-injection, chemical stabilization and solidification and thermal treatments such as incineration and thermal desorption. More recently, bioremediation has been successfully applied as a treatment process for cuttings. This review provides a current comparison of bioremediation technologies and non-biological technologies for the treatment of contaminated drill cuttings providing information on a number of factors that need to be taken into account when choosing the best technology for drilling waste management including the environmental risks associated with disposal of drilling wastes. PMID:22071177

  18. Activity plan: Directional drilling and environmental measurements while drilling

    SciTech Connect

    Myers, D.A.

    1998-07-16

    This activity plan describes the testing of directional drilling combined with environmental measurements while drilling at two Hanford Site locations. A cold test is to be conducted at the 105A Mock Tank Leak Facility in the 200 East Area. A hot test is proposed to be run at the 216-B-8 tile field north of the 241-B Tank Farm in 200 East Area. Criteria to judge the success, partial success or failure of various aspects of the test are included. The TWRS program is assessing the potential for use of directional drilling because of an identified need to interrogate the vadose zone beneath the single-shell tanks. Because every precaution must be taken to assure that investigation activities do not violate the integrity of the tanks, control of the drill bit and ability to follow a predetermined drill path are of utmost importance and are being tested.

  19. 30 CFR 33.34 - Drilling test.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES Test Requirements § 33.34 Drilling test. (a) A drilling test shall consist of...

  20. 30 CFR 33.34 - Drilling test.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES Test Requirements § 33.34 Drilling test. (a) A drilling test shall consist of...

  1. 30 CFR 33.34 - Drilling test.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES Test Requirements § 33.34 Drilling test. (a) A drilling test shall consist of...

  2. 30 CFR 33.34 - Drilling test.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES Test Requirements § 33.34 Drilling test. (a) A drilling test shall consist of...

  3. 30 CFR 33.34 - Drilling test.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...ADMINISTRATION, DEPARTMENT OF LABOR TESTING, EVALUATION, AND APPROVAL OF MINING PRODUCTS DUST COLLECTORS FOR USE IN CONNECTION WITH ROCK DRILLING IN COAL MINES Test Requirements § 33.34 Drilling test. (a) A drilling test shall consist of...

  4. 30 CFR 556.71 - Directional drilling.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 false Directional drilling. 556.71 Section 556.71 Mineral...Extensions § 556.71 Directional drilling. In accordance with an approved...by the lease. In such circumstances, drilling shall be considered to have...

  5. 30 CFR 556.71 - Directional drilling.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 false Directional drilling. 556.71 Section 556.71 Mineral...Extensions § 556.71 Directional drilling. In accordance with an approved...by the lease. In such circumstances, drilling shall be considered to have...

  6. 30 CFR 556.71 - Directional drilling.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 false Directional drilling. 556.71 Section 556.71 Mineral...Extensions § 556.71 Directional drilling. In accordance with an approved...by the lease. In such circumstances, drilling shall be considered to have...

  7. 30 CFR 57.7052 - Drilling positions.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ... 2013-07-01 2013-07-01 false Drilling positions. 57.7052 Section 57.7052...STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling-Surface and Underground § 57.7052...

  8. 30 CFR 57.7052 - Drilling positions.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ... 2014-07-01 2014-07-01 false Drilling positions. 57.7052 Section 57.7052...STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling-Surface and Underground § 57.7052...

  9. 30 CFR 57.7052 - Drilling positions.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... 2012-07-01 2012-07-01 false Drilling positions. 57.7052 Section 57.7052...STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling-Surface and Underground § 57.7052...

  10. Jack-up rig for marine drilling

    SciTech Connect

    Mueller, S. R.

    1981-05-26

    This invention relates to a mobile drilling platform of the jack -up type equipped with a special system which allows the said drilling platform to work as a drilling derrick and alternatively as a hoisting crane rig for marine service.

  11. 30 CFR 256.71 - Directional drilling.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... false Directional drilling. 256.71 Section...OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers...256.71 Directional drilling. In accordance...such circumstances, drilling shall be...

  12. 30 CFR 256.71 - Directional drilling.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... false Directional drilling. 256.71 Section...OR OIL AND GAS IN THE OUTER CONTINENTAL SHELF Assignments, Transfers...256.71 Directional drilling. In accordance...such circumstances, drilling shall be...

  13. Drilling the ``perfect'' well

    SciTech Connect

    NONE

    1999-12-01

    In northeastern British Columbia, near Fort St. John, Calahoo Petroleum is chasing the elusive finger channels of a vast alluvial fan formed by runoff from the Rocky Mountains. The Cadomin formation is a thin, shallow, tight Cretaceous sandstore lying about 1,150m below the surface and loaded with gas at virgin pressure. Reserves are estimated at 3 Bcf per section. The formation is extremely fragile, and subject to damage if drilled improperly. Pores are lined with a thin layer of kaolinite, which when invaded will flocculate and clog pore throats, reducing permeability is estimated at 1 to 2 md, and wells that strike a channel can produce up to 3 MMcf/d of gas. Miss the sweet spot in the channel, and the best one can hope for is 0.5 md and 0.5 MMcf/d of gas. Finding the channels is a real challenge. There are only a few 2D spec seismic lines criss-crossing the play, few offset wells to correlate and a blanket of shallow coal seams above the Cadomin that tunes the seismic image and makes interpretation difficult. The combination of limited formation data and drilling challenges presents a complex set of problems. The paper discusses these challenges and what Calahoo is doing to meet them using a multidisciplinary team approach.

  14. Corrosion inhibition by control of gas composition during mist drilling

    SciTech Connect

    Hinkebein, T.E.; Snyder, T.L.

    1981-05-01

    Chemical compositional specifications have been generated for inert gases which reduce drill string corrosion when used in conjunction with mist drilling processes. These specifications are based on the assumption that the corrosion rate is dependent on the dissolved gaseous species concentrations. Data taken both from the literature and from a mist drilling field test with nitrogen in Valle Grande, NM, relate corrosion rates to fluid compositions. These solution compositions are then associated with gas phase compositions using equilibrium data available from the literature and material balances. Two sources of gas were considered: cryogenically purified nitrogen from air and exhaust gas from a diesel engine, which contain (in addition to N/sub 2/ and O/sub 2/) CO/sub 2/, NO/sub x/, SO/sub 2/, H/sub 2/O, and CO. A maximum concentration of 50 ppM O/sub 2/ in the gas phase is recommended to alleviate pitting corrosion.

  15. Drilling's value stressed at hearing

    Microsoft Academic Search

    Judith A. Katzoff

    1986-01-01

    A Senate subcommittee recently heard testimony from government, university, and industry geoscientists in support of a bill that would formalize the planning and coordination of continental scientific drilling. Among the reasons given in favor of the bill by the 13 witnesses at the July 24, 1986, hearing were the possible benefits of a continental drilling program for our understanding of

  16. DOSECC Continental Scientific Drilling Program

    Microsoft Academic Search

    1987-01-01

    Deep Observation and Sampling o f the Earth's Continental Crust (DOSECC, for short) is a nonprofit corporation, currently composed of 39 member universities, that was founded to manage Continental Scientific Drilling Programs somewhat as Joint Oceanographic Institutions (JOI), Inc., manages the Ocean Drilling Program. Funding is provided by the National Science Foundation, with additional support from the U.S. Geological Survey

  17. Infill drilling for incremental recovery

    SciTech Connect

    Gould, T.L.; Sarem, A.M.

    1989-03-01

    The purpose of this paper is to summarize what has been learned over the last several years about infill drilling and to recommend when it should and should not be considered. In general, the more a reservoir deviates from ideal behavior, the greater the opportunity for incremental recovery by infill drilling.

  18. Relating horsepower to drilling productivity

    SciTech Connect

    Givens, R.; Williams, G.; Wingfield, B.

    1996-12-31

    Many technological advancements have been made in explosive products and applications over the last 15 years resulting in productivity and cost gains. However, the application of total energy (engine horsepower) in the majority of rotary drilling technology, has remained virtually unchanged over that period. While advancements have been made in components, efficiency, and types of hydraulic systems used on drills, the application of current hydraulic technology to improve drilling productivity has not been interactive with end users. This paper will investigate how traditional design assumptions, regarding typical application of horsepower in current rotary drill systems, can actually limit productivity. It will be demonstrated by numeric analysis how changing the partitioning of available hydraulic energy can optimize rotary drill productivity in certain conditions. Through cooperative design ventures with drill manufacturers, increased penetration rates ranging from 20% to 100% have been achieved. Productivity was increased initially on some rigs by careful selection of optional hydraulic equipment. Additional gains were made in drilling rates by designing the rotary hydraulic circuit to meet the drilling energies predicted by computer modeling.

  19. Synthesis of Results From Scientific Drilling in the Indian Ocean

    NASA Astrophysics Data System (ADS)

    Duncan, Robert A.; Rea, David K.; Kidd, Robert B.; von Rad, Ulrich; Weissel, Jeffrey K.

    The Ocean Drilling Program (ODP), and its predecessor the Deep Sea Drilling Project (DSDP), have been an enormously successful international scientific effort aimed at understanding the interactions of the biosphere, atmosphere, oceans, the crust and the mantle through the record of rocks, sediments and fluids in the ocean basins. More and more, ocean drilling is being seen as a critical part of long-term, integrated studies of the earth system. A large measure of this success stems from emphasis within this program on responsiveness to innovative ideas, technological developments, and long-range identification of global objectives. But how many of the scientific and technological achievements of ocean drilling are being effectively communicated to the broader earth science community? The JOIDES (Joint Oceanographic Institutions for Deep Earth Sampling) organization, which is responsible for ODP, has recognized the need to publish results in a timely manner. These reports are organized in a leg-by-leg format, two volumes per leg, the Initial Reports and Scientific Results. There has been no formal mechanism within ODP, however, to compare and integrate results from several legs, to track the progress toward a given thematic objective, or to review our new understanding of the geologic history of previously unexplored regions. This volume is a response to the need to synthesize drilling results from the nine-leg Indian Ocean campaign (1987-1989).

  20. Ocean Drilling Program Legacy

    NSDL National Science Digital Library

    The Ocean Drilling Program (ODP) conducted basic research into Earth processes by recovering sediment and rock samples from below the ocean floor and using the resulting holes to perform downhole measurements and experiments. The program, which lasted from 1983 to 2003, published thousands of pages of data and reports, which are now available online. The materials include information on sampling procedures, permanent core archives, repositories, and micropaleontological reference centers. Available publications include ODP proceedings and scientific results; initial and preliminary reports; technical notes and reports; citations; the ODP bibliography, dictionary, and editorial guide; and issues of the JOIDES (Joint Oceanographic Institutions for Deep Earth Sampling) Journal from 1975 to 2004. There are also links to ODP core data and logs and extensive data documentation. Other links access ODP outreach materials, information on engineering and science operations, cruise leg summaries and discovery highlights, and information on the administration of the program.

  1. 30 CFR 77.1008 - Relocation of drills; safeguards.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ... Relocation of drills; safeguards. (a) When a drill is being moved from one drilling area to another, drill steel, tools, and other equipment shall be secured and the mast placed in a safe position. (b) When a drill helper is...

  2. 30 CFR 77.1008 - Relocation of drills; safeguards.

    Code of Federal Regulations, 2011 CFR

    2011-07-01

    ... Relocation of drills; safeguards. (a) When a drill is being moved from one drilling area to another, drill steel, tools, and other equipment shall be secured and the mast placed in a safe position. (b) When a drill helper is...

  3. 30 CFR 56.7003 - Drill area inspection.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...HEALTH SAFETY AND HEALTH STANDARDS-SURFACE METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling § 56.7003 Drill area inspection. The drilling area shall be inspected for hazards before starting the drilling...

  4. MWD tools improve drilling performance

    SciTech Connect

    Moore, S.D.

    1986-02-01

    Downhole measurement while drilling technology is changing the way many wells are drilled. The capability to understand what is occurring at the drill bit as it actually happens is improving drilling performance, safety, and ultimately cost effectiveness. MWD evolved because of the need to acquire real-time data at the well site. The technology was not developed by vendors as simply an ''add-on'' tool - something an operator didn't realize he needed. MWD, with state-of-the-art, rugged, electronic downhole tools, is the closest thing the petroleum industry has to aerospace engineering. The constraints placed on MWD tools are greater than any other downhole tool-including wireline electric logs - because they are in the hole for long durations, operating under severe hole conditions. MWD tools were first used to monitor directional drilling operations on a real-time basis, More recently vendors have developed formation capabilities for MWD. Tools capable of measuring other drilling parameters such as weight on bit and downhole torque and pressure are also available. MWD technology continues to advance rapidly as the second and third generation of tools and equipment are introduced. Improvements are coming in many areas, but the biggest change will be in the development of new surface equipment to analyze retrieved data. For several years, MWD has been providing a reliable and accurate stream of real-time data from downhole. New software packages for surface equipment will allow the data to be analyzed in new ways to improve drilling efficiencies.

  5. Environmental monitoring of three exploratory oil and gas wells drilled near the East Flower Garden Bank in the Gulf of Mexico

    SciTech Connect

    Gettleson, D.A.; Putt, R.E.; Hammer, R.M.; Laird, C.E.

    1981-01-01

    The results of two marine environmental monitoring programs associated with the drilling of three exploratory wells near the East Flower Garden Bank on the outer continental shelf of the northwest Gulf of Mexico are described. The purpose of the monitoring programs was to define the spatial distribution of the discharged drilling fluids relative to the Bank and assess the apparent health of the predominant reef-building corals of the East Flower Garden Bank before, during, and after the drilling operations. The monitoring programs demonstrated that detectable quantities of the drilling fluids in the surficial sediments were distributed to a distance exceeding 1000 meters from the near-surface discharged well.

  6. Environmental sampling and mud sampling program of CSDP (Continental Scientific Drilling Program) core hole VC-2B, Valles Caldera, New Mexico

    SciTech Connect

    Meeker, K.; Goff, F.; Gardner, J.N.; Trujillo, P.E.; Counce, D.

    1990-03-01

    An environmental sampling and drilling mud sampling program was conducted during the drilling operations of Continental Scientific Drilling Program (CSDP) core hole VC-2B, Valles caldera, New Mexico. A suite of four springs and creeks in the Sulphur Springs area were monitored on a regular basis to ensure that the VC-2B drilling program was having no environmental impact on water quality. In addition, a regional survey of springs in and around the Jemez Mountains was conducted to provide background data for the environmental monitoring. A drilling mud monitoring program was conducted during the operations to help identify major fluid entries in the core hole. 32 refs., 14 figs., 7 tabs.

  7. Report of the Offset Drilling Workshop Ocean Drilling Program

    E-print Network

    (Leg 153) 21 Figure 4 "Rig Floor Perception" of Generic Boreholes Drilled During Leg 153 22 Figure 5 communication problems between the scientific proponents and ODP-TAMU personnel. All aspects are discussed

  8. An Investigation for Disposal of Drill Cuttings into Unconsolidated Sandstones and Clayey Sands

    SciTech Connect

    Mese, Ali; Dvorkin, Jack; Shillinglaw, John

    2000-09-11

    This project include experimental data and a set of models for relating elastic moduli/porosity/texture and static-to-dynamic moduli to strength and failure relationships for unconsolidated sands and clayey sands. The results of the project should provide the industry with a basis for wider use of oil base drilling fluids in water sensitive formations by implementing drill cutting injection into existing wells at abandoned formations and controlling fracture geometry to prevent ground water contamination.

  9. Direct Observation of Rhyolite Magma by Drilling: The Proposed Krafla Magma Drilling Project

    NASA Astrophysics Data System (ADS)

    Eichelberger, J. C.; Sigmundsson, F.; Papale, P.; Markusson, S.; Loughlin, S.

    2014-12-01

    Remarkably, drilling in Landsvirkjun Co.'s geothermal field in Krafla Caldera, Iceland has encountered rhyolite magma or hypersolidus rhyolite at 2.1-2.5 km depth in 3 wells distributed over 3.5 km2, including Iceland Deep Drilling Program's IDDP-1 (Mortensen, 2012). Krafla's most recent rifting and eruption (basalt) episode was 1975-1984; deformation since that time has been simple decay. Apparently rhyolite magma was either emplaced during that episode without itself erupting or quietly evolved in situ within 2-3 decades. Analysis of drill cuttings containing quenched melt from IDDP-1 yielded unprecedented petrologic data (Zierenberg et al, 2012). But interpreting active processes of heat and mass transfer requires knowing spatial variations in physical and chemical characteristics at the margin of the magma body, and that requires retrieving core - a not-inconceivable task. Core quenched in situ in melt up to 1150oC was recovered from Kilauea Iki lava lake, Hawaii by the Magma Energy Project >30 years ago. The site from which IDDP-1 was drilled, and perhaps IDDP-1 itself, may be available to attempt the first-ever coring of rhyolite magma, now proposed as the Krafla Magma Drilling Project (KMDP). KMDP would also include geophysical and geochemical experiments to measure the response of the magma/hydrothermal system to fluid injection and flow tests. Fundamental results will reveal the behavior of magma in the upper crust and coupling between magma and the hydrothermal system. Extreme, sustained thermal power output during flow tests of IDDP-1 suggests operation of a Kilauea-Iki-like freeze-fracture-flow boundary propagating into the magma and mining its latent heat of crystallization (Carrigan et al, EGU, 2014). Such an ultra-hot Enhanced Geothermal System (EGS) might be developable beneath this and other magma-heated conventional hydrothermal systems. Additionally, intra-caldera intrusions like Krafla's are believed to produce the unrest that is so troubling in populated calderas (e.g., Campi Flegrei, Italy). Experiments with the live system will aid in hazard assessment and eruption forecasting for this most difficult of volcano hazard problems. We will report on an International Continental Scientific Drilling Program (ICDP) workshop held to assess feasibility and to develop a plan for KMDP.

  10. 30 CFR 56.7004 - Drill mast.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ... Drilling and Rotary Jet Piercing Drilling § 56.7004 Drill mast. Persons shall not be on a mast while the drill-bit is in operation unless they are provided with a safe platform from which to work and they are required to use safety belts to...

  11. OCEAN DRILLING PROGRAM LEG 200 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 200 SCIENTIFIC PROSPECTUS DRILLING AT THE H2O LONG-TERM SEAFLOOR Director of Science Operations Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Station TX 77845-9547 USA

  12. OCEAN DRILLING PROGRAM LEG 196 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 196 SCIENTIFIC PROSPECTUS LOGGING WHILE DRILLING AND ADVANCED CORKS Deputy Director of Science Operations Ocean Drilling Program Texas A&M University 1000 Discovery Drive Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Station TX 77845-9547 USA

  13. OCEAN DRILLING PROGRAM LEG 158 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 158 SCIENTIFIC PROSPECTUS TAG: DRILLING AN ACTIVE HYDROTHERMAL SYSTEM Federal Republic of Germany Dr. Laura Stokking Staff Scientist, Leg 158 Ocean Drilling Program Texas A the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000

  14. OCEAN DRILLING PROGRAM LEG 104 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 104 SCIENTIFIC PROSPECTUS NORWEGIAN SEA Olav Eldholm Co-Chief Scientist Ocean Drilling Program Texas A & M University College Station, Texas 77843-3469 Pni±ip o Rabinowitz Director Ocean Drilling Program Robert B Kidd Manager of Science Operations Ocean Drilling Program Louis E

  15. OCEAN DRILLING PROGRAM LEG 106 PRELIMINARY REPORT

    E-print Network

    OCEAN DRILLING PROGRAM LEG 106 PRELIMINARY REPORT BARE ROCK DRILLING IN THE MID-ATLANTIC RIDGE RIFT 106 Ocean Drilling Program Texas A & M University College Station, TX 77843-3469 ±nuwiLZ" ector ODP Drilling Program, Texas A & M University, College Station, Texas 77843-3469. In some cases, orders

  16. INSTRUCTIONS INTEGRATED OCEAN DRILLING PROGRAM (IODP)

    E-print Network

    INSTRUCTIONS FOR THE INTEGRATED OCEAN DRILLING PROGRAM (IODP) MANUSCRIPT AND PHOTOGRAPH COPYRIGHT, Integrated Ocean Drilling Program, 1000 Discovery Drive, College Station, Texas 77845, USA A signed copyright of the Integrated Ocean Drilling Program or any other publications of the Integrated Ocean Drilling Program. Author

  17. Improved directional drilling will expand use

    Microsoft Academic Search

    W. C. Maurer; W. J. McDonald; W. A. Rehm

    1979-01-01

    Directional drilling is important in present energy recovery technology and will become increasingly so in the future. Limitations of directional drilling and concepts for advanced systems both present and emerging energy technologies are detailed. To be technically and economically feasible methane drainage, in-situ retorting of oil shale, and underground gasification of coal will require directional drilling. Directional drilling is important

  18. A dynamic model for rotary rock drilling

    Microsoft Academic Search

    I. E. Econini; W. H. Somerton

    1982-01-01

    A rock drilling model is developed as a set of ordinary differential equations describing discrete segments of the drilling rig, including the bit and the rock. The end segment consists of a description of the bit as a ''nonideal'' transformer and a characterization of the rock behavior. The effects on rock drilling of bottom hole cleaning, drill string-borehole interaction, and

  19. Union improves drilling efficiencies on platform Gilda

    Microsoft Academic Search

    1983-01-01

    Union Oil Co. of California is moving ahead with development drilling of its Santa Clara field from Platform Gilda in 205 ft of water off the coast of Ventura, Calif. During the development drilling program, the company has solved several drilling and completion problems to improve drilling efficiencies and reduce costs. Union installed Platform Gilda, as well as Platform Gina,

  20. Development of PDC Drill Bits for MWD Directional Drilling in Underground Coal Mine

    Microsoft Academic Search

    Dong qiong Guo; Chao Hou

    2011-01-01

    Design of high quality PDC drill bits is necessary to perform MWD directional drilling for underground coal mine. Relatively deepened analysis was carried out here from the structural parameters to the type selection of cutting teeth of PDC drill bits. ?96mm matrix-body PDC drill bit for directional drilling was developed followed by field tests, for which four branch holes were

  1. Wellbore Stability in Oil and Gas Drilling with Chemical-Mechanical Coupling

    PubMed Central

    Deng, Jingen

    2013-01-01

    Wellbore instability in oil and gas drilling is resulted from both mechanical and chemical factors. Hydration is produced in shale formation owing to the influence of the chemical property of drilling fluid. A new experimental method to measure diffusion coefficient of shale hydration is given, and the calculation method of experimental results is introduced. The diffusion coefficient of shale hydration is measured with the downhole temperature and pressure condition, then the penetration migrate law of drilling fluid filtrate around the wellbore is calculated. Furthermore, the changing rules of shale mechanical properties affected by hydration and water absorption are studied through experiments. The relationships between shale mechanical parameters and the water content are established. The wellbore stability model chemical-mechanical coupling is obtained based on the experimental results. Under the action of drilling fluid, hydration makes the shale formation softened and produced the swelling strain after drilling. This will lead to the collapse pressure increases after drilling. The study results provide a reference for studying hydration collapse period of shale. PMID:23935430

  2. A technical and economic evaluation of thermal spallation drilling technology

    SciTech Connect

    None

    1984-07-10

    Thermal spallation of rock may be defined as a type of progressive rock failure caused by the creation of thermal stresses induced by a sudden application of heat from a high temperature source. This technology is applicable to only certain types of hard rock, such as dolomite, taconite, and granite. In 1981 and 1982, the deepest holes ever drilled by this process were drilled in granite to depths of 1086 feet and 425 feet respectively. Penetration rates at the bottom of the deeper hole reached a maximum of 100 ft/hr. Because of these high rates, considerable interest was generated concerning the use of this technology for the drilling of deep holes. Based on this interest, this study was undertaken to evaluate the technical and economic aspects of the technology in general. This methodology has been used for blasthole drilling, the cutting of chambers at the bottom of drilled holes, and the cutting of narrow grooves in rock. However, because of the very high temperatures generated by the flame jet and the application of the technology to only certain types of rock, other areas of use have been very limited. In this report, evaluation of the technology was performed by conceptually designing and costing a theoretical flame jet drilling rig. The design process reviews a number of different concepts of the various components needed, and then chooses those pieces of equipment that best suit the needs of the system and have the best chance of being properly developed. The final concept consists of a flexible umbilical hose containing several internal hoses for carrying the various required fluids. An evaluation of this system was then made to determine its operational characteristics. The drilling capabilities and the economics of this rig were then compared to a conventional rotary drilling rig by theoretically drilling two holes of approximately 15,000 feet in depth. This comparison was done by use of a spread sheet type computer program. The results of this study indicate that flame jet drilling performs significantly better in both time and cost. These results are due primarily to the high penetration rates, the reduced number of trips, and the decreased trip time due to the use of the umbilical. However, this significant time and cost advantage must be tempered by the fact that they are based on the assumption that the main components of the flame jet rig can be realistically and reliably built. Unfortunately, the use of an umbilical system presents very realistic and difficult design problems as hole depth extends beyond 7000 feet. Thus, unless a significant market for the use of this equipment can be found, further development of an umbilical type system is very questionable. An alternate system suggests by LASL may circumvent many of the problems stated. This concept consists of using concentric pipes and a down hole fluid separation system. Concentric pipe built by the Walker-Neer Manufacturing Company, Wichita Falls, Texas, has been used successfully in the drilling industry for years. Fluid separators have also been developed and used. Although this concept also presents problems, it may be worth investigating.

  3. Ultracapacitor-Powered Cordless Drill

    NASA Technical Reports Server (NTRS)

    Eichenberg, Dennis J.

    2007-01-01

    The figure depicts a portable, hand-held power drill with its attached power-supply unit, in which ultracapacitors, rather than batteries, are used to store energy. This ultra capacitor-powered drill is a product of continuing efforts to develop the technological discipline known as hybrid power management (HPM), which is oriented toward integration of diverse electric energy-generating, energy-storing, and energy-consuming devices in optimal configurations.

  4. Rotary steerable motor system for underground drilling

    DOEpatents

    Turner, William E. (Durham, CT); Perry, Carl A. (Middletown, CT); Wassell, Mark E. (Kingwood, TX); Barbely, Jason R. (Middletown, CT); Burgess, Daniel E. (Middletown, CT); Cobern, Martin E. (Cheshire, CT)

    2008-06-24

    A preferred embodiment of a system for rotating and guiding a drill bit in an underground bore includes a drilling motor and a drive shaft coupled to drilling motor so that drill bit can be rotated by the drilling motor. The system further includes a guidance module having an actuating arm movable between an extended position wherein the actuating arm can contact a surface of the bore and thereby exert a force on the housing of the guidance module, and a retracted position.

  5. Failure mechanisms of polycrystalline diamond compact drill bits in geothermal environments

    SciTech Connect

    Hoover, E.R.; Pope, L.E.

    1981-09-01

    Over the past few years the interest in polycrystalline diamond compact (PDC) drill bits has grown proportionately with their successful use in drilling oil and gas wells in the North Sea and the United States. This keen interest led to a research program at Sandia to develop PDC drill bits suitable for the severe drilling conditions encountered in geothermal fields. Recently, three different PDC drill bits were tested using either air or mud drilling fluids: one in the laboratory with hot air, one in the Geysers field with air, and one in the Geysers field with mud. All three tests were unsuccessful due to failure of the braze joint used to attach the PDC drill blanks to the tungsten carbide studs. A post-mortem failure analysis of the defective cutters identified three major failure mechanisms: peripheral nonbonding caused by braze oxidation during the brazing step, nonbonding between PDC drill blanks and the braze due to contamination prior to brazing, and hot shortness. No evidence was found to suggest that the braze failures in the Geysers field tests were caused by frictional heating. In addition, inspection of the PDC/stud cutter assemblies using ultrasonic techniques was found to be ineffective for detecting the presence of hot shortness in the braze joint.

  6. Exploratory hydrocarbon drilling impacts to Arctic lake ecosystems.

    PubMed

    Thienpont, Joshua R; Kokelj, Steven V; Korosi, Jennifer B; Cheng, Elisa S; Desjardins, Cyndy; Kimpe, Linda E; Blais, Jules M; Pisaric, Michael F J; Smol, John P

    2013-01-01

    Recent attention regarding the impacts of oil and gas development and exploitation has focused on the unintentional release of hydrocarbons into the environment, whilst the potential negative effects of other possible avenues of environmental contamination are less well documented. In the hydrocarbon-rich and ecologically sensitive Mackenzie Delta region (NT, Canada), saline wastes associated with hydrocarbon exploration have typically been disposed of in drilling sumps (i.e., large pits excavated into the permafrost) that were believed to be a permanent containment solution. However, failure of permafrost as a waste containment medium may cause impacts to lakes in this sensitive environment. Here, we examine the effects of degrading drilling sumps on water quality by combining paleolimnological approaches with the analysis of an extensive present-day water chemistry dataset. This dataset includes lakes believed to have been impacted by saline drilling fluids leaching from drilling sumps, lakes with no visible disturbances, and lakes impacted by significant, naturally occurring permafrost thaw in the form of retrogressive thaw slumps. We show that lakes impacted by compromised drilling sumps have significantly elevated lakewater conductivity levels compared to control sites. Chloride levels are particularly elevated in sump-impacted lakes relative to all other lakes included in the survey. Paleolimnological analyses showed that invertebrate assemblages appear to have responded to the leaching of drilling wastes by a discernible increase in a taxon known to be tolerant of elevated conductivity coincident with the timing of sump construction. This suggests construction and abandonment techniques at, or soon after, sump establishment may result in impacts to downstream aquatic ecosystems. With hydrocarbon development in the north predicted to expand in the coming decades, the use of sumps must be examined in light of the threat of accelerated permafrost thaw, and the potential for these industrial wastes to impact sensitive Arctic ecosystems. PMID:24223170

  7. Development and verification of a dynamic underbalanced drilling simulator

    SciTech Connect

    Wang, Z.; Vefring, E.H.; Rommetveit, R. [RF-Rogaland Research, Bergen (Norway); Bieseman, T. [Shell RTS, Rijswijk (Netherlands); Maglione, R. [Agip Spa, Milano (Italy); Lage, A.C.; Nakagawa, E. [Petrobras/CENPES, Rio de Janeiro (Brazil)

    1997-07-01

    A dynamic underbalanced drilling (UBD) simulator has been developed in a joint industry project. The simulator incorporates models for multiphase flow, well-reservoir interaction, gas/oil solubility and gas injection systems. The fluid components in the system include injected gases, mud, produced gas, produced oil and water and drilled cuttings. Both coiled tubing and conventional jointed pipe can be simulated. The primary use of the simulator is in the planning phase of an UBD operation. An UBD operation is very dynamic due to the changes in flow conditions and other operations. The importance of the dynamic effects is illustrated by a field example. The dynamic simulator allows for the analysis of various operations that cannot be analyzed with a steady state simulator. Some of these operations include starting/stopping circulation; various gas injection techniques, e.g.: parasitic string, parasitic casing, through completion, and drill string injection; drilling operations: drilling, tripping, pipe connections, and BHA deployment. To verify the simulator, two phase flow tests in near-horizontal annulus were performed in order to provide data for validation. Field data are actively collected for this purpose. In this paper, two field cases are presented. One is a coiled tubing drilling operation in Dalen field in the Netherlands where a Nitrogen lift test was performed in a through completion configuration. The second case is a UBD operation in Candeias field in Brazil. In this case, drillstring gas injection tests were performed in a cemented 9-5/8-in. casing at 1,800 m.

  8. DAME: Planetary-Prototype Drilling Automation

    NASA Astrophysics Data System (ADS)

    Glass, B.; Cannon, H.; Branson, M.; Hanagud, S.; Paulsen, G.

    2008-06-01

    We describe results from the Drilling Automation for Mars Exploration (DAME) project, including those of the summer 2006 tests from an Arctic analog site. The drill hardware is a hardened, evolved version of the Advanced Deep Drill by Honeybee Robotics. DAME has developed diagnostic and executive software for hands-off surface operations of the evolved version of this drill. The DAME drill automation tested from 2004 through 2006 included adaptively controlled drilling operations and the downhole diagnosis of drilling faults. It also included dynamic recovery capabilities when unexpected failures or drilling conditions were discovered. DAME has developed and tested drill automation software and hardware under stressful operating conditions during its Arctic field testing campaigns at a Mars analog site.

  9. DAME: planetary-prototype drilling automation.

    PubMed

    Glass, B; Cannon, H; Branson, M; Hanagud, S; Paulsen, G

    2008-06-01

    We describe results from the Drilling Automation for Mars Exploration (DAME) project, including those of the summer 2006 tests from an Arctic analog site. The drill hardware is a hardened, evolved version of the Advanced Deep Drill by Honeybee Robotics. DAME has developed diagnostic and executive software for hands-off surface operations of the evolved version of this drill. The DAME drill automation tested from 2004 through 2006 included adaptively controlled drilling operations and the downhole diagnosis of drilling faults. It also included dynamic recovery capabilities when unexpected failures or drilling conditions were discovered. DAME has developed and tested drill automation software and hardware under stressful operating conditions during its Arctic field testing campaigns at a Mars analog site. PMID:18597659

  10. Drill wear: its effect on the diameter of drilled holes 

    E-print Network

    Reichert, William Frederick

    1955-01-01

    . 1?587 1, 823 1, 018 878 re+ . /aia. l. 585 1, 195 1, 050 f t ~ /'aia. 100. 5 97 8 108 ~ 1 99. 7 The spiadle of the drill yress was caref;. lip cheched. oskag x dial iadicato?, . to detersiae the aao~xat of rca-oat. The I/O iaoh drill... distribution, 3/8 inch holes 20 X ?nd R control chart, 5/16 inch holes Frequency distribution, 5/16 iach holes 92 List of Figures, continued ~iture RR X and R control chart, 7/16 inch holes 23 Frequency distribution, 7/16 inch holes . . . 105 R4...

  11. Near-Term Developments in Geothermal Drilling

    SciTech Connect

    Dunn, James C.

    1989-03-21

    The DOE Hard Rock Penetration program is developing technology to reduce the costs of drilling geothermal wells. Current projects include: R & D in lost circulation control, high temperature instrumentation, underground imaging with a borehole radar insulated drill pipe development for high temperature formations, and new technology for data transmission through drill pipe that can potentially greatly improve data rates for measurement while drilling systems. In addition to this work, projects of the Geothermal Drilling Organization are managed. During 1988, GDO projects include developments in five areas: high temperature acoustic televiewer, pneumatic turbine, urethane foam for lost circulation control, geothermal drill pipe protectors, an improved rotary head seals.

  12. Effects of implant drill wear, irrigation, and drill materials on heat generation in osteotomy sites.

    PubMed

    Koo, Ki-Tae; Kim, Min-Ho; Kim, Hae-Young; Wikesjö, Ulf M E; Yang, Jae-Ho; Yeo, In-Sung

    2015-04-01

    This study evaluated the effects of drill wear on bone temperature during osteotomy preparation with 3 types of drills and compared heat production between drills. The drills used in this study were titanium nitride-coated metal, tungsten carbide carbon-coated metal, and zirconia ceramic drills. An osteotomy 11 mm in depth was formed in bovine scapular bone following the manufacturer's recommended drill sequences. Drilling was performed without irrigation and repeated 20 times; temperature was measured every 5 times. Next, 200 rounds of drilling during irrigation were performed for each drill, with temperature change monitored until round 200. Analysis of variance statistics were used for analyses of the measured data. Drilling without irrigation showed significant thermal increase at all time points compared to drilling with irrigation (P < .001). No significant difference was found between drill materials. Under irrigation, the frequency of previous drilling had minimal effects on thermal change. The repeated-measures analysis of variance revealed major thermal change at the initial time point (P < .0001), and the multiple comparison tests revealed a significant difference in temperature between the initial drills that had been used 50 or fewer times and those that had been used more than 50 times, irrespective of the drill material. The results of this study indicate that the initial drill should be changed in osteotomy preparation with irrigation after they have been used 50 times. Irrigation may be a more critical factor for the control of temperature elevation than is the drill material. PMID:24313461

  13. Nozzle assembly for an earth boring drill bit

    SciTech Connect

    Madigan, J. A.

    1985-09-24

    A nozzle assembly for an earth boring drill bit of the type adapted to receive drilling fluid under pressure and having a nozzle bore in the bottom thereof positioned closely adjacent the well bore bottom when the bit is in engagement therewith with the bore having inner and outer portions. The nozzle assembly comprises a generally cylindrical nozzle member of abrasion and erosion resistant material, selected from a plurality of such members, each being of the same outer diameter but having passaging therein of different cross-sectional area. The nozzle member is adapted to be fitted in the inner portion of the nozzle bore in sealing relationship therewith for forming a first seal for the nozzle assembly. The nozzle assembly further comprises a locknut, separate from the nozzle member, for detachbably securing the nozzle member in the nozzle bore, formed at least in part of an abrasion and erosion resistant material. The locknut has a threaded side wall engageable with the outer portion of the nozzle bore, and an aperture therethrough for enabling a stream of drilling fluid from the nozzle member to flow therethrough and being so configured in section as to receive a tool for turning the lockout to install it in and remove it from the nozzle bore.

  14. Apparatus for drilling a curved subterranean borehole

    SciTech Connect

    Warren, T.M.; Mount, H.B.; Winters, W.J.

    1993-05-25

    Curve drilling assembly connectable to a rotary drill string for drilling a curved subterranean borehole having an inside radius and an outside radius, the assembly is described, comprising: curve guide means connectable with the drill string for deflecting the drill string toward the outside radius of a curved borehole; a rotary drill bit having a base portion disposed about a longitudinal bit axis for connection through the curve guide means with the drill string, a gauge portion disposed about the longitudinal bit axis and extending from the base portion, a face portion disposed about the longitudinal bit axis and extending from the gauge portion, and a plurality of cutting elements disposed on the face portion; a flexible joint for connecting the drill bit with the curve guide means; imbalance force means, rotatable with the drill string, for creating a net imbalance force along a net imbalance force vector substantially perpendicular to the longitudinal bit axis during drilling; and bearing means, rotatable with the drill string and located in the curve drilling assembly near the cutting elements for intersecting a force plane formed by the longitudinal bit axis and the net imbalance force vector and for substantially continuously contacting the borehole wall during drilling.

  15. Directional drilling and earth curvature

    SciTech Connect

    Williamson, H.S.; Wilson, H.F.

    2000-03-01

    This paper provides a review of current practices for calculating directional drilling placement in the light of modern extended-reach applications. The review highlights the potential for gross errors in the application of geodetic reference information and errors inherent in the calculation method. Both types of error are quantified theoretically and illustrated with a real example. The authors borrow established land surveying calculation methods to develop a revised best practice for directional drilling. For the elimination of gross errors they prescribe increased awareness and a more disciplined approach to the handling of positional data.

  16. Up drill sub for use in rotary drilling

    Microsoft Academic Search

    1985-01-01

    A tool, provided in the form of an up-drill sub, is comprised of a cylindrical body having a plurality of lobes integrally formed therewith and radially extending therefrom. Each lobe in turn is provided with a plurality of diamond cutting elements on an upwardly inclined surface of the lobe. The lobes are separated by channels or junk slots. The diamond

  17. 30 CFR 57.7003 - Drill area inspection.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling-Surface Only § 57.7003 Drill area inspection. The drilling area shall be inspected for hazards before starting the...

  18. 30 CFR 57.7003 - Drill area inspection.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling-Surface Only § 57.7003 Drill area inspection. The drilling area shall be inspected for hazards before starting the...

  19. 30 CFR 57.7003 - Drill area inspection.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...SAFETY AND HEALTH STANDARDS-UNDERGROUND METAL AND NONMETAL MINES Drilling and Rotary Jet Piercing Drilling-Surface Only § 57.7003 Drill area inspection. The drilling area shall be inspected for hazards before starting the...

  20. Stakeholder acceptance analysis ResonantSonic drilling

    SciTech Connect

    Peterson, T. [Battelle Seattle Research Center, WA (United States)

    1995-12-01

    This report presents evaluations, recommendations, and requirements concerning ResonantSonic Drilling (Sonic Drilling), derived from a three-year program of stakeholder involvement. Sonic Drilling is an innovative method to reach contamination in soil and groundwater. The resonant sonic drill rig uses counter-rotating weights to generate energy, which causes the drill pipe to vibrate elastically along its entire length. In the resonant condition, forces of up to 200,000 pounds are transmitted to the drill bit face to create a cutting action. The resonant energy causes subsurface materials to move back into the adjacent formation, permitting the drill pipe to advance. This report is for technology developers and those responsible for making decisions about the use of technology to remediate contamination by volatile organic compounds. Stakeholders` perspectives help those responsible for technology deployment to make good decisions concerning the acceptability and applicability of sonic drilling to the remediation problems they face.

  1. Development of Autonomous Drills for Planetary Exploration

    NASA Astrophysics Data System (ADS)

    Paulsen, G. L.; Mumm, E.; Kennedy, T.; Chu, P.; Davis, K.; Frader-Thompson, S.; Petrich, K.; Glass, B.

    2006-03-01

    Honeybee Robotics has developed science driven drill systems to allow scientific instruments direct access to the subsurface. Embedded drill segment electronics accommodate sensors and actuators for high rate data transmission to the surface.

  2. 30 CFR 250.1605 - Drilling requirements.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND SULPHUR... (f) Fixed drilling platforms. Applications for...installation of fixed drilling platforms or structures including...provisions of subpart I, Platforms and Structures,...

  3. 30 CFR 250.1605 - Drilling requirements.

    Code of Federal Regulations, 2010 CFR

    2010-07-01

    ...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND SULPHUR... (f) Fixed drilling platforms. Applications for...installation of fixed drilling platforms or structures including...provisions of subpart I, Platforms and Structures,...

  4. 30 CFR 250.1605 - Drilling requirements.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...DEPARTMENT OF THE INTERIOR OFFSHORE OIL AND GAS AND SULPHUR... (f) Fixed drilling platforms. Applications for...installation of fixed drilling platforms or structures including...provisions of subpart I, Platforms and Structures,...

  5. Modeling and Adhesive Tool Wear in Dry Drilling of Aluminum Alloys

    NASA Astrophysics Data System (ADS)

    Girot, F.; Gutiérrez-Orrantia, M. E.; Calamaz, M.; Coupard, D.

    2011-01-01

    One of the challenges in aeronautic drilling operations is the elimination of cutting fluids while maintaining the quality of drilled parts. This paper therefore aims to increase the tool life and process quality by working on relationships existing between drilling parameters (cutting speed and feed rate), coatings and tool geometry. In dry drilling, the phenomenon of Built-Up Layer is the predominant damage mechanism. A model fitting the axial force with the cutting parameters and the damage has been developed. The burr thickness and its dispersion decrease with the feed rate. The current diamond coatings which exhibit a strong adhesion to the carbide substrate can limit this adhesive layer phenomenon. A relatively smooth nano-structured coating strongly limits the development of this layer.

  6. Environmental Measurement While Drilling System for Real-Time Field Screening of Contaminants

    SciTech Connect

    Lockwood, G.J.; Normann, R.A.; Williams, C.V.

    1999-02-22

    Sampling during environmental drilling is essential to fully characterize the spatial distribution and migration of subsurface contaminants. However, analysis of the samples is expensive and time-consuming: off-site laboratory analysis can take weeks or months. Real-time information on environmental conditions, drill bit location and temperature during drilling is valuable in many environmental restoration operations. This type of information can be used to provide field screening data and improved efficiency of site characterization activities. The Environmental Measurement-While-Drilling (EMWD) System represents an innovative blending of new and existing technology in order to obtain real-time data during drilling. The system consists of two subsystems. The down-hole subsystem (at the drill bit) consists of sensors, a power supply, a signal conditioning and transmitter board, and a radio-frequency (RF) coaxial cable. The up-hole subsystem consists of a battery pack/coil, pickup coil, receiver, and personal computer. The system is compatible with fluid miser drill pipe, a directional drilling technique that uses minimal drilling fluids and generates little to no secondary waste. In EMWD, downhole sensors are located behind the drill bit and linked by a high-speed data transmission system to a computer at the surface. Sandia-developed Windows{trademark}-based software is used for data display and storage. As drilling is conducted, data is collected on the nature and extent of contamination, enabling on-the-spot decisions regarding drilling and sampling strategies. Initially, the downhole sensor consisted of a simple gamma radiation detector, a Geiger-Mueller tube (GMT). The design includes data assurance techniques to increase safety by reducing the probability of giving a safe indication when an unsafe condition exists. The EMWD system has been improved by the integration of a Gamma Ray Spectrometer (GRS) in place of the GMT. The GRS consists of a sodium iodide-thallium activated crystal coupled to a photomultiplier tube (PMT). The output of the PMT goes to a multichannel analyzer (MCA).The MCA data is transmitted to the surface via a signal conditioning and transmitter board similar to that used with the GMT. The EMWD system is described and the results of the GRS field tests and field demonstration are presented.

  7. Proceedings of IADC Middle East Drilling Conference, Dubai, November 1998. 1 IADC Middle East Drilling Conference

    E-print Network

    Aamodt, Agnar

    Proceedings of IADC Middle East Drilling Conference, Dubai, November 1998. 1 IADC Middle East Drilling Conference Case-Based Reasoning, a method for gaining experience and giving advise on how to avoid and how to free stuck drill strings. IADC Middle East Drilling Conference, Dubai, Nov. 3 - 4, 1998. P

  8. Downhole drilling network using burst modulation techniques

    DOEpatents

    Hall; David R. (Provo, UT), Fox; Joe (Spanish Fork, UT)

    2007-04-03

    A downhole drilling system is disclosed in one aspect of the present invention as including a drill string and a transmission line integrated into the drill string. Multiple network nodes are installed at selected intervals along the drill string and are adapted to communicate with one another through the transmission line. In order to efficiently allocate the available bandwidth, the network nodes are configured to use any of numerous burst modulation techniques to transmit data.

  9. North American drilling activity in 1982

    Microsoft Academic Search

    1983-01-01

    This is the 57th consecutive annual report on drilling activity for the United States. Canadian drilling data have been included since 1948; Mexico provided data for the period 1948 to 1980. For 1982, Canada showed an 8.7% decrease in total wells drilled (6,561 wells) and an 11.9% decrease in the amount of footage drilled (23,737,415 ft). The 166 newfield discoveries

  10. Improve dust capture on your surface drill

    SciTech Connect

    Page, S.J.; Listak, J.M.; Reed, R.

    2008-09-15

    Researchers have developed a model to describe airborne respirable dust (ARD) generation on surface coal mine drills. By measuring a few basic parameters and using a graph, a drill operator or engineer can estimate the relative severity of drill dust emissions as well as how much of a reduction in ARD can be obtained by changing any given parameter. 4 refs., 2 figs.

  11. Diamond Drilling Specification Manual and Course Outline.

    ERIC Educational Resources Information Center

    British Columbia Dept. of Education, Victoria.

    This publication presents the standards required of a person practicing diamond drilling in western Canada and provides an outline for teaching the skills and knowledge. It is divided into two parts. The Diamond Drilling Specification Manual establishes the levels of skill and knowledge required in the four certified levels of diamond drilling

  12. Sonic gas detector for rotary drilling system

    Microsoft Academic Search

    Dowdy

    1981-01-01

    In a rotary drilling system using a drill string, and a mud circulating system, in which mud is passed from a pump to a standpipe and drill string, to and through the bit, into the annulus of the borehole, and to the surface, a method of detecting the entry of gas into the mud in the annulus at or near

  13. 30 CFR 57.7004 - Drill mast.

    Code of Federal Regulations, 2012 CFR

    2012-07-01

    ...Rotary Jet Piercing Drilling-Surface Only § 57.7004 Drill mast. Persons shall not be on a mast while the drill-bit is in operation unless they are provided with a safe platform from which to work and they are required to use safety belts to...

  14. 30 CFR 57.7004 - Drill mast.

    Code of Federal Regulations, 2013 CFR

    2013-07-01

    ...Rotary Jet Piercing Drilling-Surface Only § 57.7004 Drill mast. Persons shall not be on a mast while the drill-bit is in operation unless they are provided with a safe platform from which to work and they are required to use safety belts to...

  15. 30 CFR 57.7004 - Drill mast.

    Code of Federal Regulations, 2014 CFR

    2014-07-01

    ...Rotary Jet Piercing Drilling-Surface Only § 57.7004 Drill mast. Persons shall not be on a mast while the drill-bit is in operation unless they are provided with a safe platform from which to work and they are required to use safety belts to...

  16. OCEAN DRILLING PROGRAM LEG 112 PRELIMINARY REPORT

    E-print Network

    OCEAN DRILLING PROGRAM LEG 112 PRELIMINARY REPORT PERU CONTINENTAL MARGIN Roland von Huene Co Staff Scientist, Leg 112 Ocean Drilling Program Texas A&M University College Station, TX 77843 be obtained from the Director, Ocean Drilling Program, Texas A&M University, College Station, Texas 77843

  17. OCEAN DRILLING PROGRAM LEG 176 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 176 SCIENTIFIC PROSPECTUS RETURN TO HOLE 735B Dr. Henry Dick Co.S.A. Dr. Jay Miller Staff Scientist, Leg 176 Ocean Drilling Program Texas A&M University Research Park portion requires the written consent of the Director, Ocean Drilling Program, Texas A&M University

  18. OCEAN DRILLING PROGRAM LEG 145 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 145 SCIENTIFIC PROSPECTUS NORTH PACIFIC TRANSECT Dr. Ivan A. Basov Dr 48109-1063 Dr. Thomas Janecek Staff Scientist, Leg 145 Ocean Drilling Program Texas A&M University requires the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park

  19. OCEAN DRILLING PROGRAM LEG 159 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 159 SCIENTIFIC PROSPECTUS THE COTE D'IVOIRE - GHANA TRANSFORM MARGIN, Leg 159 Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive College Station requires the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park

  20. OCEAN DRILLING PROGRAM LEG 156 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 156 SCIENTIFIC PROSPECTUS NORTHERN BARBADOS RIDGE Dr. Tom Shipley Dr Austin, Texas 78579 Japan U.S.A. Dr. Peter Blum Staff Scientist, Leg 156 Ocean Drilling Program Texas A of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000 Discovery Drive, College Station

  1. OCEAN DRILLING PROGRAM LEG 146 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 146 SCIENTIFIC PROSPECTUS CASCADIA MARGIN Dr. Graham K. Westbrook Dr, Pennsylvania Dr. Robert Musgrave Staff Scientist, Leg 146 Ocean Drilling Program Texas A&M University Research of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000 Discovery Drive, College Station

  2. OCEAN DRILLING PROGRAM LEG 201 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 201 SCIENTIFIC PROSPECTUS CONTROLS ON MICROBIAL COMMUNITIES IN DEEPLY. Jack Baldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University 1000 Manager and Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College

  3. OCEAN DRILLING PROGRAM LEG 184 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 184 SCIENTIFIC PROSPECTUS SOUTH CHINA SEA Dr. Warren L. Prell Co's Republic of China Dr. Peter Blum Staff Scientist Ocean Drilling Program Texas A&M University Research Park the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000

  4. OCEAN DRILLING PROGRAM LEG 195 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 195 SCIENTIFIC PROSPECTUS MARIANA CONVERGENT MARGIN/ WEST PHILIPPINE SEA Baldauf Deputy Director of Science Operations Ocean Drilling Program Texas A&M University 1000 Discovery and Staff Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Station TX

  5. OCEAN DRILLING PROGRAM LEG 163 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 163 SCIENTIFIC PROSPECTUS SOUTHEAST GREENLAND MARGIN Dr. Hans Corvallis, OR 97331-5503 U.S.A. Dr. James F. Allan Staff Scientist, Leg 163 Ocean Drilling Program Texas A the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000

  6. OCEAN DRILLING PROGRAM LEG 207 SCIENTIFIC PROSPECTUS

    E-print Network

    June 2002 OCEAN DRILLING PROGRAM LEG 207 SCIENTIFIC PROSPECTUS DEMERARA RISE: EQUATORIAL CRETACEOUS Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Station TX 77845-9547 USA -------------------------------- Dr. Mitchell Malone Staff Scientist and Leg Project Manager Ocean Drilling Program Texas A

  7. OCEAN DRILLING PROGRAM LEG 136 SCIENTIFIC PROSPECTUS

    E-print Network

    of the Ocean Drilling Program in consultation with the Planning Committee and the Pollution PreventionOCEAN DRILLING PROGRAM LEG 136 SCIENTIFIC PROSPECTUS Ocean Seismographic Network Pilot Hole Scientist, Leg 136 Ocean Drilling Program Texas A&M University College Station, Texas 77845-9547 Philip D

  8. OCEAN DRILLING PROGRAM LEG 177 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 177 SCIENTIFIC PROSPECTUS SOUTHERN OCEAN PALEOCEANOGRAPHY Dr. David 177 Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive College Station of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000 Discovery Drive, College Station

  9. OCEAN DRILLING PROGRAM LEG 172 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 172 SCIENTIFIC PROSPECTUS NW ATLANTIC SEDIMENT DRIFTS Dr. Lloyd D Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive College Station, Texas portion requires the written consent of the Director, Ocean Drilling Program, Texas A&M University

  10. OCEAN DRILLING PROGRAM LEG 139 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 139 SCIENTIFIC PROSPECTUS Sedimented Ridges I Dr. Earl Davis Co of Hawaii 1000 Pope Road Honolulu, Hawaii 96822 Dr. Andrew Fisher Staff Scientist, Leg 139 Ocean Drilling the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000

  11. OCEAN DRILLING PROGRAM LEG 188 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 188 SCIENTIFIC PROSPECTUS PRYDZ BAY-COOPERATION SEA, ANTARCTICA: GLACIAL Stanford University Stanford, CA 94305-2115 Dr. Carl Richter Staff Scientist Ocean Drilling Program Texas A portion requires the written consent of the Director, Ocean Drilling Program, Texas A&M University

  12. OCEAN DRILLING PROGRAM LEG 161 SCIENTIFIC PROSPECTUS

    E-print Network

    of the Ocean Drilling Program in consultation with the Planning Committee and the Pollution PreventionOCEAN DRILLING PROGRAM LEG 161 SCIENTIFIC PROSPECTUS MEDITERRANEAN SEA II - THE WESTERN Ocean Drilling Program Texas A&M University Research Park 1000 Discovery Drive College Station, Texas

  13. OCEAN DRILLING PROGRAM LEG 169 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 169 SCIENTIFIC PROSPECTUS SEDIMENTARY RIDGES II Dr. Yves Fouquet Dr the written consent of the Director, Ocean Drilling Program, Texas A&M University Research Park, 1000://www-odp.tamu.edu/publications. D I S C L A I M E R This publication was prepared by the Ocean Drilling Program, Texas A

  14. OCEAN DRILLING PROGRAM LEG 151 SCIENTIFIC PROSPECTUS

    E-print Network

    of the Ocean Drilling Program in consultation with the Planning Committee and the Pollution PreventionOCEAN DRILLING PROGRAM LEG 151 SCIENTIFIC PROSPECTUS NORTH ATLANTIC ARCTIC GATEWAYS 1 Dr. Annik M Scientist, Leg 151 Ocean Drilling Program Texas A&M University Research Park College Station, Texas 77845

  15. OCEAN DRILLING PROGRAM LEG 191 SCIENTIFIC PROSPECTUS

    E-print Network

    OCEAN DRILLING PROGRAM LEG 191 SCIENTIFIC PROSPECTUS NORTHWEST PACIFIC SEISMIC OBSERVATORY Director of Science Operations Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Scientist Ocean Drilling Program Texas A&M University 1000 Discovery Drive College Station TX 77845-9547 USA

  16. OCEAN DRILLING PROGRAM LEG 138 SCIENTIFIC PROSPECTUS

    E-print Network

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